net/bridge/br_multicast: remove redundant variable "err"

The err is not modified after initalization, So remove it and make
it to be void function.

Signed-off-by: zhong jiang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/bridge/br_multicast.c

···
 	br_multicast_mark_router(br, port);
 }
 
-static int br_ip4_multicast_query(struct net_bridge *br,
-				  struct net_bridge_port *port,
-				  struct sk_buff *skb,
-				  u16 vid)
+static void br_ip4_multicast_query(struct net_bridge *br,
+				   struct net_bridge_port *port,
+				   struct sk_buff *skb,
+				   u16 vid)
 {
 	const struct iphdr *iph = ip_hdr(skb);
 	struct igmphdr *ih = igmp_hdr(skb);
···
 	unsigned long now = jiffies;
 	unsigned int offset = skb_transport_offset(skb);
 	__be32 group;
-	int err = 0;
 
 	spin_lock(&br->multicast_lock);
 	if (!netif_running(br->dev) ||
···
 
 out:
 	spin_unlock(&br->multicast_lock);
-	return err;
 }
 
 #if IS_ENABLED(CONFIG_IPV6)
···
 		err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
 		break;
 	case IGMP_HOST_MEMBERSHIP_QUERY:
-		err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
+		br_ip4_multicast_query(br, port, skb_trimmed, vid);
 		break;
 	case IGMP_HOST_LEAVE_MESSAGE:
 		br_ip4_multicast_leave_group(br, port, ih->group, vid, src);