[NETLINK]: Use tgid instead of pid for nlmsg_pid

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 8c38ee6..96020d7 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -476,7 +476,7 @@
 	struct hlist_head *head;
 	struct sock *osk;
 	struct hlist_node *node;
-	s32 pid = current->pid;
+	s32 pid = current->tgid;
 	int err;
 	static s32 rover = -4097;