Revert "msm: kgsl: Add per context timestamp"

This reverts commit 2a811252c73a9beae002c95cdeef974f8be0579f.

Change-Id: Ic3018f19eb1a089ae67e0f3c253cc00e7d0285e3
Signed-off-by: Wei Zou <wzou@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_drm.c b/drivers/gpu/msm/kgsl_drm.c
index 8a38587..03f8c42 100644
--- a/drivers/gpu/msm/kgsl_drm.c
+++ b/drivers/gpu/msm/kgsl_drm.c
@@ -1397,7 +1397,7 @@
 	}
 
 	device = kgsl_get_device(ts_device);
-	ts_done = kgsl_check_timestamp(device, NULL, args->timestamp);
+	ts_done = kgsl_check_timestamp(device, args->timestamp);
 
 	mutex_lock(&dev->struct_mutex);