drm/vram-helper: make drm_vram_mm_debugfs_init() return 0

Since 987d65d0 (drm: debugfs: make
drm_debugfs_create_files() never fail), drm_debugfs_create_files() never
fails and should return void. Therefore, remove its use as the
return value of drm_vram_mm_debugfs_init(), and have the function
return 0 directly.

v2: have drm_vram_mm_debugfs_init() return 0 instead of void to avoid
introducing build issues and build breakage.

References: https://lists.freedesktop.org/archives/dri-devel/2020-February/257183.htmlSigned-off-by: Wambui Karuga <wambui.karugax@gmail.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200310133121.27913-11-wambui.karugax@gmail.com

drivers/gpu/drm/drm_gem_vram_helper.c

@@ -1048,14 +1048,12 @@ static const struct drm_info_list drm_vram_mm_debugfs_list[] = {
  */
 int drm_vram_mm_debugfs_init(struct drm_minor *minor)
 {
-	int ret = 0;
-
 #if defined(CONFIG_DEBUG_FS)
-	ret = drm_debugfs_create_files(drm_vram_mm_debugfs_list,
+	drm_debugfs_create_files(drm_vram_mm_debugfs_list,
 				 ARRAY_SIZE(drm_vram_mm_debugfs_list),
 				 minor->debugfs_root, minor);
 #endif
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL(drm_vram_mm_debugfs_init);