net: bridge: remove redundant check of f->dst

In br_fill_forward_path(), f->dst is checked not to be NULL, then
immediately read using READ_ONCE and checked again. The first check is
useless, so this patch aims to remove the redundant check of f->dst.
Signed-off-by: linke li <lilinke99@qq.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_device.c

@@ -389,7 +389,7 @@ static int br_fill_forward_path(struct net_device_path_ctx *ctx,
 	br_vlan_fill_forward_path_pvid(br, ctx, path);
 
 	f = br_fdb_find_rcu(br, ctx->daddr, path->bridge.vlan_id);
-	if (!f || !f->dst)
+	if (!f)
 		return -1;
 
 	dst = READ_ONCE(f->dst);