drm/i915: intel_frontbuffer_flush can now be static

So make it static.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_drv.h

@@ -977,9 +977,6 @@ void intel_frontbuffer_flip_prepare(struct drm_device *dev,
 				    unsigned frontbuffer_bits);
 void intel_frontbuffer_flip_complete(struct drm_device *dev,
 				     unsigned frontbuffer_bits);
-void intel_frontbuffer_flush(struct drm_device *dev,
-			     unsigned frontbuffer_bits,
-			     enum fb_op_origin origin);
 void intel_frontbuffer_flip(struct drm_device *dev,
 			    unsigned frontbuffer_bits);
 unsigned int intel_fb_align_height(struct drm_device *dev,

drivers/gpu/drm/i915/intel_frontbuffer.c

@@ -113,7 +113,7 @@ void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
  *
  * Can be called without any locks held.
  */
-void intel_frontbuffer_flush(struct drm_device *dev,
+static void intel_frontbuffer_flush(struct drm_device *dev,
 				    unsigned frontbuffer_bits,
 				    enum fb_op_origin origin)
 {