wifi: at76c50x: use sizeof(*pointer) instead of sizeof(type)

It is preferred to use sizeof(*pointer) instead of sizeof(type)
due to the type of the variable can change and one needs not
change the former (unlike the latter). This patch has no effect
on runtime behavior.

At the same time remove some redundant NULL initializations.
Signed-off-by: Erick Archer <erick.archer@outlook.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/AS8PR02MB7237C784C14DBC943CB719F88BFE2@AS8PR02MB7237.eurprd02.prod.outlook.com

drivers/net/wireless/atmel/at76c50x-usb.c

@@ -332,7 +332,7 @@ static int at76_dfu_get_status(struct usb_device *udev,
 
 	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), DFU_GETSTATUS,
 			      USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
-			      0, 0, status, sizeof(struct dfu_status),
+			      0, 0, status, sizeof(*status),
 			      USB_CTRL_GET_TIMEOUT);
 	return ret;
 }
@@ -366,7 +366,7 @@ static int at76_usbdfu_download(struct usb_device *udev, u8 *buf, u32 size,
 	u32 dfu_timeout = 0;
 	int bsize = 0;
 	int blockno = 0;
-	struct dfu_status *dfu_stat_buf = NULL;
+	struct dfu_status *dfu_stat_buf;
 	u8 *dfu_state = NULL;
 	u8 *block = NULL;
 
@@ -378,7 +378,7 @@ static int at76_usbdfu_download(struct usb_device *udev, u8 *buf, u32 size,
 		return -EINVAL;
 	}
 
-	dfu_stat_buf = kmalloc(sizeof(struct dfu_status), GFP_KERNEL);
+	dfu_stat_buf = kmalloc(sizeof(*dfu_stat_buf), GFP_KERNEL);
 	if (!dfu_stat_buf) {
 		ret = -ENOMEM;
 		goto exit;
@@ -931,14 +931,12 @@ static void at76_dump_mib_mac_addr(struct at76_priv *priv)
 {
 	int i;
 	int ret;
-	struct mib_mac_addr *m = kmalloc(sizeof(struct mib_mac_addr),
-					 GFP_KERNEL);
+	struct mib_mac_addr *m = kmalloc(sizeof(*m), GFP_KERNEL);
 
 	if (!m)
 		return;
 
-	ret = at76_get_mib(priv->udev, MIB_MAC_ADDR, m,
-			   sizeof(struct mib_mac_addr));
+	ret = at76_get_mib(priv->udev, MIB_MAC_ADDR, m, sizeof(*m));
 	if (ret < 0) {
 		wiphy_err(priv->hw->wiphy,
 			  "at76_get_mib (MAC_ADDR) failed: %d\n", ret);
@@ -961,13 +959,12 @@ static void at76_dump_mib_mac_wep(struct at76_priv *priv)
 	int i;
 	int ret;
 	int key_len;
-	struct mib_mac_wep *m = kmalloc(sizeof(struct mib_mac_wep), GFP_KERNEL);
+	struct mib_mac_wep *m = kmalloc(sizeof(*m), GFP_KERNEL);
 
 	if (!m)
 		return;
 
-	ret = at76_get_mib(priv->udev, MIB_MAC_WEP, m,
-			   sizeof(struct mib_mac_wep));
+	ret = at76_get_mib(priv->udev, MIB_MAC_WEP, m, sizeof(*m));
 	if (ret < 0) {
 		wiphy_err(priv->hw->wiphy,
 			  "at76_get_mib (MAC_WEP) failed: %d\n", ret);
@@ -997,14 +994,12 @@ static void at76_dump_mib_mac_wep(struct at76_priv *priv)
 static void at76_dump_mib_mac_mgmt(struct at76_priv *priv)
 {
 	int ret;
-	struct mib_mac_mgmt *m = kmalloc(sizeof(struct mib_mac_mgmt),
-					 GFP_KERNEL);
+	struct mib_mac_mgmt *m = kmalloc(sizeof(*m), GFP_KERNEL);
 
 	if (!m)
 		return;
 
-	ret = at76_get_mib(priv->udev, MIB_MAC_MGMT, m,
-			   sizeof(struct mib_mac_mgmt));
+	ret = at76_get_mib(priv->udev, MIB_MAC_MGMT, m, sizeof(*m));
 	if (ret < 0) {
 		wiphy_err(priv->hw->wiphy,
 			  "at76_get_mib (MAC_MGMT) failed: %d\n", ret);
@@ -1035,12 +1030,12 @@ static void at76_dump_mib_mac_mgmt(struct at76_priv *priv)
 static void at76_dump_mib_mac(struct at76_priv *priv)
 {
 	int ret;
-	struct mib_mac *m = kmalloc(sizeof(struct mib_mac), GFP_KERNEL);
+	struct mib_mac *m = kmalloc(sizeof(*m), GFP_KERNEL);
 
 	if (!m)
 		return;
 
-	ret = at76_get_mib(priv->udev, MIB_MAC, m, sizeof(struct mib_mac));
+	ret = at76_get_mib(priv->udev, MIB_MAC, m, sizeof(*m));
 	if (ret < 0) {
 		wiphy_err(priv->hw->wiphy,
 			  "at76_get_mib (MAC) failed: %d\n", ret);
@@ -1072,12 +1067,12 @@ static void at76_dump_mib_mac(struct at76_priv *priv)
 static void at76_dump_mib_phy(struct at76_priv *priv)
 {
 	int ret;
-	struct mib_phy *m = kmalloc(sizeof(struct mib_phy), GFP_KERNEL);
+	struct mib_phy *m = kmalloc(sizeof(*m), GFP_KERNEL);
 
 	if (!m)
 		return;
 
-	ret = at76_get_mib(priv->udev, MIB_PHY, m, sizeof(struct mib_phy));
+	ret = at76_get_mib(priv->udev, MIB_PHY, m, sizeof(*m));
 	if (ret < 0) {
 		wiphy_err(priv->hw->wiphy,
 			  "at76_get_mib (PHY) failed: %d\n", ret);
@@ -1130,13 +1125,12 @@ static void at76_dump_mib_local(struct at76_priv *priv)
 static void at76_dump_mib_mdomain(struct at76_priv *priv)
 {
 	int ret;
-	struct mib_mdomain *m = kmalloc(sizeof(struct mib_mdomain), GFP_KERNEL);
+	struct mib_mdomain *m = kmalloc(sizeof(*m), GFP_KERNEL);
 
 	if (!m)
 		return;
 
-	ret = at76_get_mib(priv->udev, MIB_MDOMAIN, m,
-			   sizeof(struct mib_mdomain));
+	ret = at76_get_mib(priv->udev, MIB_MDOMAIN, m, sizeof(*m));
 	if (ret < 0) {
 		wiphy_err(priv->hw->wiphy,
 			  "at76_get_mib (MDOMAIN) failed: %d\n", ret);
@@ -1375,7 +1369,7 @@ static int at76_startup_device(struct at76_priv *priv)
 		 priv->scan_min_time, priv->scan_max_time,
 		 priv->scan_mode == SCAN_TYPE_ACTIVE ? "active" : "passive");
 
-	memset(ccfg, 0, sizeof(struct at76_card_config));
+	memset(ccfg, 0, sizeof(*ccfg));
 	ccfg->promiscuous_mode = 0;
 	ccfg->short_retry_limit = priv->short_retry_limit;
 
@@ -1411,7 +1405,7 @@ static int at76_startup_device(struct at76_priv *priv)
 	ccfg->beacon_period = cpu_to_le16(priv->beacon_period);
 
 	ret = at76_set_card_command(priv->udev, CMD_STARTUP, &priv->card_config,
-				    sizeof(struct at76_card_config));
+				    sizeof(*ccfg));
 	if (ret < 0) {
 		wiphy_err(priv->hw->wiphy, "at76_set_card_command failed: %d\n",
 			  ret);
@@ -2443,7 +2437,7 @@ static int at76_probe(struct usb_interface *interface,
 	struct usb_device *udev;
 	int op_mode;
 	int need_ext_fw = 0;
-	struct mib_fw_version *fwv = NULL;
+	struct mib_fw_version *fwv;
 	int board_type = (int)id->driver_info;
 
 	udev = usb_get_dev(interface_to_usbdev(interface));
@@ -2531,7 +2525,7 @@ static int at76_probe(struct usb_interface *interface,
 
 	usb_set_intfdata(interface, priv);
 
-	memcpy(&priv->fw_version, fwv, sizeof(struct mib_fw_version));
+	memcpy(&priv->fw_version, fwv, sizeof(*fwv));
 	priv->board_type = board_type;
 
 	ret = at76_init_new_device(priv, interface);