videoout: Return a negative error code in vo_queue_buffer()

Most functions return 0 on success and a negative error code otherwise,
make vo_queue_buffer() conform with that.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/videoout.c b/videoout.c
index 51279e3..51bed8b 100644
--- a/videoout.c
+++ b/videoout.c
@@ -228,13 +228,13 @@ int vo_queue_buffer(struct videoout *vo, struct v4l2_video_buffer *buffer)
 
 	if (vo->queued[buffer->index]) {
 		fprintf(stderr, "buffer already queued\n");
-		return 0;
+		return -EBUSY;
 	}
 
 	ret = v4l2_queue_buffer(vo->dev, buffer);
 	if (ret < 0) {
 		perror("VIDIOC_QBUF\n");
-		return 0;
+		return ret;
 	}
 
 	vo->queued[buffer->index] = 1;
@@ -250,5 +250,5 @@ int vo_queue_buffer(struct videoout *vo, struct v4l2_video_buffer *buffer)
 		vo->ops->watch_fd(vo->dev->fd);
 
 	vo->num_queued++;
-	return 1;
+	return 0;
 }