ice: remove unnecessary expression that is always true

The else conditional expression is always true due to the if conditional
expression; remove it and add a comment to make it obvious still.

Signed-off-by: Bruce Allan <[e-mail]>
Tested-by: Andrew Bowers <[e-mail]>
Signed-off-by: Jeff Kirsher <[e-mail]>

drivers/net/ethernet/intel/ice/ice_main.c

···
 				vsi->current_netdev_flags &= ~IFF_ALLMULTI;
 				goto out_promisc;
 			}
-		} else if (!(vsi->current_netdev_flags & IFF_ALLMULTI)) {
+		} else {
+			/* !(vsi->current_netdev_flags & IFF_ALLMULTI) */
 			if (vsi->vlan_ena)
 				promisc_m = ICE_MCAST_VLAN_PROMISC_BITS;
 			else