drm: mediatek: fixup drm_gem_object_lookup API change

The drm_gem_object_lookup() function prototype changed while this
driver was added, so it fails to build now:

drivers/gpu/drm/mediatek/mtk_drm_gem.c: In function 'mtk_drm_gem_dumb_map_offset':
drivers/gpu/drm/mediatek/mtk_drm_gem.c:142:30: error: passing argument 1 of 'drm_gem_object_lookup' from incompatible pointer type [-Werror=incompatible-pointer-types]
  obj = drm_gem_object_lookup(dev, file_priv, handle);

This fixes the new caller as well.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: a8ad0bd84f98 ("drm: Remove unused drm_device from drm_gem_object_lookup()")
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1463587653-3035181-4-git-send-email-arnd@arndb.de

drivers/gpu/drm/mediatek/mtk_drm_fb.c

@@ -138,7 +138,7 @@ struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
 	if (drm_format_num_planes(cmd->pixel_format) != 1)
 		return ERR_PTR(-EINVAL);
 
-	gem = drm_gem_object_lookup(dev, file, cmd->handles[0]);
+	gem = drm_gem_object_lookup(file, cmd->handles[0]);
 	if (!gem)
 		return ERR_PTR(-ENOENT);
 

drivers/gpu/drm/mediatek/mtk_drm_gem.c

@@ -139,7 +139,7 @@ int mtk_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 	struct drm_gem_object *obj;
 	int ret;
 
-	obj = drm_gem_object_lookup(dev, file_priv, handle);
+	obj = drm_gem_object_lookup(file_priv, handle);
 	if (!obj) {
 		DRM_ERROR("failed to lookup gem object.\n");
 		return -EINVAL;