drm/gem: make drm_gem_object_handle_unreference_unlocked static

No one outside of drm should use this, the official interfaces are
drm_gem_handle_create and drm_gem_handle_delete. The handle refcounting
is purely an implementation detail of gem.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_gem.c

@@ -231,7 +231,7 @@ static void drm_gem_object_handle_free(struct drm_gem_object *obj)
 	}
 }
 
-void
+static void
 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
 {
 	if (WARN_ON(obj->handle_count == 0))

include/drm/drmP.h

@@ -1580,7 +1580,6 @@ int drm_gem_handle_create(struct drm_file *file_priv,
 			  u32 *handlep);
 int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
 
-void drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj);
 
 void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
 int drm_gem_create_mmap_offset(struct drm_gem_object *obj);