NET: bna, fix lock imbalance

bnad_set_rx_mode omit to unlock bna_lock on one fail path. Fix that.
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Cc: Debashis Dutt <ddutt@brocade.com>
Cc: Rasesh Mody <rmody@brocade.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bna/bnad.c

@@ -2702,7 +2702,7 @@ bnad_set_rx_mode(struct net_device *netdev)
 			kzalloc((mc_count + 1) * ETH_ALEN,
 				GFP_ATOMIC);
 		if (!mcaddr_list)
-			return;
+			goto unlock;
 
 		memcpy(&mcaddr_list[0], &bnad_bcast_addr[0], ETH_ALEN);
 
@@ -2715,6 +2715,7 @@ bnad_set_rx_mode(struct net_device *netdev)
 		/* Should we enable BNAD_CF_ALLMULTI for err != 0 ? */
 		kfree(mcaddr_list);
 	}
+unlock:
 	spin_unlock_irqrestore(&bnad->bna_lock, flags);
 }