drm/i915: Update missing kerneldoc

Not sure why so much slips through when 0day is catching these. Hopefully
the much faster sphinx toolchain helps in unlazying people.

Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1468612088-9721-10-git-send-email-daniel.vetter@ffwll.ch
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e37f73d..e40fab1 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -916,7 +916,7 @@
 /**
  * This is the fast pwrite path, where we copy the data directly from the
  * user into the GTT, uncached.
- * @dev: drm device pointer
+ * @i915: i915 device private data
  * @obj: i915 gem object
  * @args: pwrite arguments structure
  * @file: drm file pointer