staging: wilc1000: replace kmalloc/memcpy with kmemdup

This patch replaces kmalloc followed by memcpy with kmemdup.
It is also added error checking of kmemdup.
Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -3124,8 +3124,10 @@ int host_int_add_wep_key_bss_sta(struct host_if_drv *hif_drv,
 	msg.body.key_info.type = WEP;
 	msg.body.key_info.action = ADDKEY;
 	msg.drv = hif_drv;
-	msg.body.key_info.attr.wep.key = kmalloc(len, GFP_KERNEL);
-	memcpy(msg.body.key_info.attr.wep.key, key, len);
+	msg.body.key_info.attr.wep.key = kmemdup(key, len, GFP_KERNEL);
+	if (!msg.body.key_info.attr.wep.key)
+		return -ENOMEM;
+
 	msg.body.key_info.attr.wep.key_len = len;
 	msg.body.key_info.attr.wep.index = index;