[PATCH] client: Fix handling display->reader_count if poll fails

[Neil Roberts]

In wl_display_dispatch_queue, if poll fails then it would previously
return immediately and leak a reference in display->reader_count. Then
if the application ignores the error and tries to read again it will
block forever. This can happen for example if the poll fails with
EINTR which the application might consider to be a recoverable error.
This patch just makes it decrement the reader count when poll fails.
---
 src/wayland-client.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/wayland-client.c b/src/wayland-client.c
index 48f06c7..576a773 100644
--- a/src/wayland-client.c
+++ b/src/wayland-client.c
@@ -1224,8 +1224,10 @@ wl_display_dispatch_queue(struct wl_display *display,
 
 	pfd[0].fd = display->fd;
 	pfd[0].events = POLLIN;
-	if (poll(pfd, 1, -1) == -1)
+	if (poll(pfd, 1, -1) == -1) {
+		display->reader_count--;
 		return -1;
+	}
 
 	pthread_mutex_lock(&display->mutex);
 
-- 
1.8.3.1