net: tipc: fix a missing check for nla_nest_start

nla_nest_start may fail. The fix check its status and returns
-EMSGSIZE in case it fails.

Signed-off-by: Kangjie Lu <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/tipc/socket.c

···
 	peer_port = tsk_peer_port(tsk);
 
 	nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
+	if (!nest)
+		return -EMSGSIZE;
 
 	if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
 		goto msg_full;