sfc: Replace memset with eth_zero_addr

Use eth_zero_addr to assign zero address to the given address array
instead of memset when the second argument in memset is address
of zero which makes the code clearer and also add header
file linux/etherdevice.h
Signed-off-by: Shyam Saini <mayhs11saini@gmail.com>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef10_sriov.c

@@ -6,6 +6,7 @@
  * under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation, incorporated herein by reference.
  */
+#include <linux/etherdevice.h>
 #include <linux/pci.h>
 #include <linux/module.h>
 #include "net_driver.h"
@@ -554,7 +555,7 @@ int efx_ef10_sriov_set_vf_mac(struct efx_nic *efx, int vf_i, u8 *mac)
 	return 0;
 
 fail:
-	memset(vf->mac, 0, ETH_ALEN);
+	eth_zero_addr(vf->mac);
 	return rc;
 }