sunrpc: fix braino in ->poll()

POLL_OUT isn't what callers of ->poll() are expecting to see; it's
actually __SI_POLL | 2 and it's a siginfo code, not a poll bitmap
bit...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
Cc: Bruce Fields <bfields@fieldses.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 33fb105..5199bb1 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -921,7 +921,7 @@
 	poll_wait(filp, &queue_wait, wait);
 
 	/* alway allow write */
-	mask = POLL_OUT | POLLWRNORM;
+	mask = POLLOUT | POLLWRNORM;
 
 	if (!rp)
 		return mask;