drm: make various debugfs_init() functions return 0

Since commit 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 various debugfs_init() functions in drm, and have these
functions return 0 directly.

v2: convert debugfs_init() functions to return 0 instead of void to
avoid build breakage.

References: https://lists.freedesktop.org/archives/dri-devel/2020-February/257183.htmlSigned-off-by: Wambui Karuga <wambui.karugax@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200310133121.27913-16-wambui.karugax@gmail.com

drivers/gpu/drm/drm_atomic.c

@@ -1643,8 +1643,9 @@ static const struct drm_info_list drm_atomic_debugfs_list[] = {
 
 int drm_atomic_debugfs_init(struct drm_minor *minor)
 {
-	return drm_debugfs_create_files(drm_atomic_debugfs_list,
+	drm_debugfs_create_files(drm_atomic_debugfs_list,
 				 ARRAY_SIZE(drm_atomic_debugfs_list),
 				 minor->debugfs_root, minor);
+	return 0;
 }
 #endif

drivers/gpu/drm/drm_client.c

@@ -459,8 +459,10 @@ static const struct drm_info_list drm_client_debugfs_list[] = {
 
 int drm_client_debugfs_init(struct drm_minor *minor)
 {
-	return drm_debugfs_create_files(drm_client_debugfs_list,
+	drm_debugfs_create_files(drm_client_debugfs_list,
 				 ARRAY_SIZE(drm_client_debugfs_list),
 				 minor->debugfs_root, minor);
+
+	return 0;
 }
 #endif

drivers/gpu/drm/drm_framebuffer.c

@@ -1209,8 +1209,10 @@ static const struct drm_info_list drm_framebuffer_debugfs_list[] = {
 
 int drm_framebuffer_debugfs_init(struct drm_minor *minor)
 {
-	return drm_debugfs_create_files(drm_framebuffer_debugfs_list,
+	drm_debugfs_create_files(drm_framebuffer_debugfs_list,
 				 ARRAY_SIZE(drm_framebuffer_debugfs_list),
 				 minor->debugfs_root, minor);
+
+	return 0;
 }
 #endif