drm/i915: Fix vblank count variable types

The vblank counts are u32 so make flip_queued_vblank and
flip_ready_vblank u32 as well.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_drv.h

@@ -834,8 +834,8 @@ struct intel_unpin_work {
 	u32 flip_count;
 	u32 gtt_offset;
 	struct drm_i915_gem_request *flip_queued_req;
-	int flip_queued_vblank;
-	int flip_ready_vblank;
+	u32 flip_queued_vblank;
+	u32 flip_ready_vblank;
 	bool enable_stall_check;
 };