[PATCH] drm: Fix comment typo

[min tang]

The double `buffer' is duplicated in line 96, remove one.

Signed-off-by: min tang <tangmin at cdjrlc.com>
---
 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 2ff31717a3de..25660c30bbbf 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -92,7 +92,7 @@
  * corrected timestamp.
  *
  * On a lot of display hardware, programming needs to take effect during the
- * vertical blanking period so that settings like gamma, the image buffer
+ * vertical blanking period so that settings like gamma, the image
  * buffer to be scanned out, etc. can safely be changed without showing
  * any visual artifacts on the screen. In some unforgiving hardware, some of
  * this programming has to both start and end in the same vblank. To help
-- 
2.17.1