reservation: fix small comment typo

Signed-off-by: NRob Clark <robdclark@gmail.com>
[danvet: Mark up as function for proper cross-linking.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1471640134-30888-1-git-send-email-robdclark@gmail.com

drivers/dma-buf/reservation.c

@@ -205,7 +205,7 @@ reservation_object_add_shared_replace(struct reservation_object *obj,
  * @fence: the shared fence to add
  *
  * Add a fence to a shared slot, obj->lock must be held, and
- * reservation_object_reserve_shared_fence has been called.
+ * reservation_object_reserve_shared() has been called.
  */
 void reservation_object_add_shared_fence(struct reservation_object *obj,
 					 struct fence *fence)