MIPS: AR7: Replace mac address parsing

Replace sscanf() with mac_pton().

[ralf@linux-mips.org: Resolved conflict.]
Signed-off-by: Daniel Walter <dwalter@google.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7151/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ar7/platform.c

@@ -307,10 +307,7 @@ static void __init cpmac_get_mac(int instance, unsigned char *dev_addr)
 	}
 
 	if (mac) {
-		if (sscanf(mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
-					&dev_addr[0], &dev_addr[1],
-					&dev_addr[2], &dev_addr[3],
-					&dev_addr[4], &dev_addr[5]) != 6) {
+		if (!mac_pton(mac, dev_addr)) {
 			pr_warn("cannot parse mac address, using random address\n");
 			eth_random_addr(dev_addr);
 		}