staging: rtl8192u: r8192U_core: fix use ether_addr_copy() over memcpy() code style...

staging: rtl8192u: r8192U_core: fix use ether_addr_copy() over memcpy() code style issue

Prefer ether_addr_copy() over memcpy() if the Ethernet addresses
are __aligned(2)

The values used are stored as dev_addr in net_device (declared in
include/linux/netdevice.h) and sa_data in sockaddr (declared in
include/linux/socket.h). Both these elements are u16 aligned as
shown by using pahole (position must be a multiple of sizeof(u16)):
unsigned char *            dev_addr;             /*   888     8 */
char                       sa_data[14];          /*     2    14 */

It is thus safe to use ether_addr_copy() instead of memcpy() for
that call, as it is already done in multiple files in the Linux
kernel sources:
  drivers/net/ethernet/broadcom/genet/bcmgenet.c
  drivers/net/ethernet/brocade/bna/bnad.c
  drivers/net/ethernet/emulex/benet/be_main.c
  drivers/net/ethernet/ezchip/nps_enet.c
  drivers/net/ethernet/ibm/ibmveth.c
  drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
  drivers/net/ethernet/intel/i40e/i40e_main.c
  drivers/net/ethernet/mellanox/mlx5/core/en_main.c
  drivers/net/usb/lan78xx.c
  net/8021q/vlan_dev.c
  net/batman-adv/soft-interface.c
  net/dsa/slave.c

Signed-off-by: Raphaël Beamonte <raphael.beamonte@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>