gro: avoid checking for a failed search

After searching for a protocol handler in dev_gro_receive, checking for
failure is redundant. Skip the failure code after finding the
corresponding handler.
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20221108123320.GA59373@debianSigned-off-by: Paolo Abeni <pabeni@redhat.com>

net/core/gro.c

@@ -489,9 +489,13 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(ptype, head, list) {
-		if (ptype->type != type || !ptype->callbacks.gro_receive)
-			continue;
+		if (ptype->type == type && ptype->callbacks.gro_receive)
+			goto found_ptype;
+	}
+	rcu_read_unlock();
+	goto normal;
 
+found_ptype:
 	skb_set_network_header(skb, skb_gro_offset(skb));
 	skb_reset_mac_len(skb);
 	BUILD_BUG_ON(sizeof_field(struct napi_gro_cb, zeroed) != sizeof(u32));
@@ -522,12 +526,8 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
 	pp = INDIRECT_CALL_INET(ptype->callbacks.gro_receive,
 				ipv6_gro_receive, inet_gro_receive,
 				&gro_list->list, skb);
-		break;
-	}
-	rcu_read_unlock();
 
-	if (&ptype->list == head)
-		goto normal;
+	rcu_read_unlock();
 
 	if (PTR_ERR(pp) == -EINPROGRESS) {
 		ret = GRO_CONSUMED;