drm/i915: Fix kerneldoc warnings for i915_gem_request

drivers/gpu/drm/i915/i915_gem_request.c:941: warning: No description found for parameter 'write'
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180208111453.32567-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem_request.c

@@ -918,9 +918,9 @@ i915_gem_request_await_dma_fence(struct drm_i915_gem_request *req,
 
 /**
  * i915_gem_request_await_object - set this request to (async) wait upon a bo
- *
  * @to: request we are wishing to use
  * @obj: object which may be in use on another ring.
+ * @write: whether the wait is on behalf of a writer
  *
  * This code is meant to abstract object synchronization with the GPU.
  * Conceptually we serialise writes between engines inside the GPU.