drm/qxl: more fence wait rework

Move qxl_io_notify_oom() call into wait condition.
That way the driver will call it again if one call
wasn't enough.

Also allows to remove the extra dma_fence_is_signaled()
check and the goto.

Fixes: 5a838e5d ("drm/qxl: simplify qxl_fence_wait")
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20210217123213.2199186-3-kraxel@redhat.com

drivers/gpu/drm/qxl/qxl_release.c

@@ -62,16 +62,12 @@ static long qxl_fence_wait(struct dma_fence *fence, bool intr,
 
 	qdev = container_of(fence->lock, struct qxl_device, release_lock);
 
-	if (dma_fence_is_signaled(fence))
-		goto signaled;
-
-	qxl_io_notify_oom(qdev);
 	if (!wait_event_timeout(qdev->release_event,
-				dma_fence_is_signaled(fence),
+				(dma_fence_is_signaled(fence) ||
+				 (qxl_io_notify_oom(qdev), 0)),
 				timeout))
 		return 0;
 
-signaled:
 	cur = jiffies;
 	if (time_after(cur, end))
 		return 0;