net: marvell: prestera: fix uninitialized vid in prestera_port_vlans_add

prestera_bridge_port_vlan_add should have been called with vlan->vid,
however this was masked by the presence of the local vid variable and I
did not notice the build warning.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: b7a9e0da ("net: switchdev: remove vid_begin -> vid_end range from VLAN objects")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Taras Chornyi <tchornyi@marvell.com>
Link: https://lore.kernel.org/r/20210114083556.2274440-1-olteanv@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/prestera/prestera_switchdev.c

@@ -1007,7 +1007,6 @@ static int prestera_port_vlans_add(struct prestera_port *port,
 	struct prestera_bridge_port *br_port;
 	struct prestera_switch *sw = port->sw;
 	struct prestera_bridge *bridge;
-	u16 vid;
 
 	if (netif_is_bridge_master(dev))
 		return 0;
@@ -1021,7 +1020,7 @@ static int prestera_port_vlans_add(struct prestera_port *port,
 		return 0;
 
 	return prestera_bridge_port_vlan_add(port, br_port,
-					     vid, flag_untagged,
+					     vlan->vid, flag_untagged,
 					     flag_pvid, extack);
 }