drm/i915: Fix kerneldoc warnings for i915_gem_userptr

drivers/gpu/drm/i915/i915_gem_userptr.c:761: warning: No description found for parameter 'dev'
drivers/gpu/drm/i915/i915_gem_userptr.c:761: warning: No description found for parameter 'data'
drivers/gpu/drm/i915/i915_gem_userptr.c:761: warning: No description found for parameter 'file'

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/20180208111328.32422-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem_userptr.c

@@ -721,7 +721,7 @@ static const struct drm_i915_gem_object_ops i915_gem_userptr_ops = {
 	.release = i915_gem_userptr_release,
 };
 
-/**
+/*
  * Creates a new mm object that wraps some normal memory from the process
  * context - user memory.
  *
@@ -757,7 +757,9 @@ static const struct drm_i915_gem_object_ops i915_gem_userptr_ops = {
  * dma-buf instead.
  */
 int
-i915_gem_userptr_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
+i915_gem_userptr_ioctl(struct drm_device *dev,
+		       void *data,
+		       struct drm_file *file)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_i915_gem_userptr *args = data;