net: annotate ->poll() instances

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 5d28abf..bbd97d3 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -850,11 +850,11 @@ static int vsock_shutdown(struct socket *sock, int mode)
 	return err;
 }
 
-static unsigned int vsock_poll(struct file *file, struct socket *sock,
+static __poll_t vsock_poll(struct file *file, struct socket *sock,
 			       poll_table *wait)
 {
 	struct sock *sk;
-	unsigned int mask;
+	__poll_t mask;
 	struct vsock_sock *vsk;
 
 	sk = sock->sk;