staging: rtl8712: Use ether_addr_copy() instead of memcpy()

Fixes Warning encounter this by applying checkpatch.pl against this file:
Prefer ether_addr_copy() over memcpy() if the Ethernet addresses
are __aligned(2)

pahole output for respective structures:
- addr->sa_data
struct sockaddr {
sa_family_t sa_family; /* 0 2 */
char sa_data[14]; /* 2 14 */

/* size: 16, cachelines: 1, members: 2 */
/* last cacheline: 16 bytes */
};

- pnetdev->dev_addr
dev_addr is interface address infor from generic net_device structure
which is properly aligned and have some patches with this change as well.
"staging: rtl8712: fix Prefer ether_addr_copy() over memcpy()"
(sha1: 36e4d8826b317080e283e4edd08bf8d5ac706f38)

Signed-off-by: Jagan Teki <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Larry Finger <[e-mail]>
Cc: Florian Schilhabel <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8712/os_intfs.c

···
 	struct sockaddr *addr = p;
 
 	if (padapter->bup == false)
-		memcpy(pnetdev->dev_addr, addr->sa_data, ETH_ALEN);
+		ether_addr_copy(pnetdev->dev_addr, addr->sa_data);
 	return 0;
 }