drm/i915: Wrap drm_gem_object_lookup in i915_gem_object_lookup

For symmetry with a forthcoming i915_gem_object_get() and
i915_gem_object_put().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1469005202-9659-4-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469017917-15134-3-git-send-email-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2f7af85..77d3205 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15089,8 +15089,8 @@
 	struct drm_i915_gem_object *obj;
 	struct drm_mode_fb_cmd2 mode_cmd = *user_mode_cmd;
 
-	obj = to_intel_bo(drm_gem_object_lookup(filp, mode_cmd.handles[0]));
-	if (&obj->base == NULL)
+	obj = i915_gem_object_lookup(filp, mode_cmd.handles[0]);
+	if (!obj)
 		return ERR_PTR(-ENOENT);
 
 	fb = intel_framebuffer_create(dev, &mode_cmd, obj);