net: dwc-xlgmac: Get rid of custom hex_dump_to_buffer()

Get rid of custom hex_dump_to_buffer().

The output is slightly changed, i.e. each byte followed by white space.

Note, we don't use print_hex_dump() here since the original code uses
nedev_dbg().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jie Deng <jiedeng@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/synopsys/dwc-xlgmac-common.c

@@ -333,9 +333,8 @@ void xlgmac_print_pkt(struct net_device *netdev,
 		      struct sk_buff *skb, bool tx_rx)
 {
 	struct ethhdr *eth = (struct ethhdr *)skb->data;
-	unsigned char *buf = skb->data;
 	unsigned char buffer[128];
-	unsigned int i, j;
+	unsigned int i;
 
 	netdev_dbg(netdev, "\n************** SKB dump ****************\n");
 
@@ -346,22 +345,13 @@ void xlgmac_print_pkt(struct net_device *netdev,
 	netdev_dbg(netdev, "Src MAC addr: %pM\n", eth->h_source);
 	netdev_dbg(netdev, "Protocol: %#06hx\n", ntohs(eth->h_proto));
 
-	for (i = 0, j = 0; i < skb->len;) {
-		j += snprintf(buffer + j, sizeof(buffer) - j, "%02hhx",
-			      buf[i++]);
-
-		if ((i % 32) == 0) {
-			netdev_dbg(netdev, "  %#06x: %s\n", i - 32, buffer);
-			j = 0;
-		} else if ((i % 16) == 0) {
-			buffer[j++] = ' ';
-			buffer[j++] = ' ';
-		} else if ((i % 4) == 0) {
-			buffer[j++] = ' ';
-		}
+	for (i = 0; i < skb->len; i += 32) {
+		unsigned int len = min(skb->len - i, 32U);
+
+		hex_dump_to_buffer(&skb->data[i], len, 32, 1,
+				   buffer, sizeof(buffer), false);
+		netdev_dbg(netdev, "  %#06x: %s\n", i, buffer);
 	}
-	if (i % 32)
-		netdev_dbg(netdev, "  %#06x: %s\n", i - (i % 32), buffer);
 
 	netdev_dbg(netdev, "\n************** SKB dump ****************\n");
 }