qlcnic: Fix potential NULL dereference

[net-next:master 301/302] drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c:563
 qlcnic_set_multi() error: potential null dereference 'cur'. (kzalloc returns null)

o Break out of the loop after memory allocation failure. Program all the
  MAC addresses that were cached in the return path.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c

@@ -560,6 +560,8 @@ void qlcnic_set_multi(struct net_device *netdev)
 			netdev_for_each_mc_addr(ha, netdev) {
 				cur = kzalloc(sizeof(struct qlcnic_mac_list_s),
 					      GFP_ATOMIC);
+				if (cur == NULL)
+					break;
 				memcpy(cur->mac_addr,
 				       ha->addr, ETH_ALEN);
 				list_add_tail(&cur->list, &adapter->vf_mc_list);