[PATCH] drm/vblank: Simplify drm_dev_has_vblank()

[Rob Clark <robdclark@gmail.com>]

From: Rob Clark <robdclark@chromium.org>

What does vblank have to do with num_crtcs?  Well, this was technically
correct, but you'd have to go look at where num_crtcs is initialized to
understand why.  Lets just replace it with the simpler and more obvious
check.

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
 drivers/gpu/drm/drm_vblank.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 877e2067534f..ad34c235d853 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -575,7 +575,7 @@ EXPORT_SYMBOL(drm_vblank_init);
  */
 bool drm_dev_has_vblank(const struct drm_device *dev)
 {
-	return dev->num_crtcs != 0;
+	return !!dev->vblank;
 }
 EXPORT_SYMBOL(drm_dev_has_vblank);
 
-- 
2.39.2