drm/omap: remove checks for return value of drm_debugfs functions

Since 987d65d0 (drm: debugfs: make
drm_debugfs_create_files() never fail), there is no need to ever check
the return value for drm_debugfs_create_files(). Therefore remove the
checks for the return value and subsequent error handling in
omap_debugfs_init().

These changes also enables the changing of omap_debugfs_init() to return
0 directly.

v2: convert omap_debugfs_init() to return 0 instead of void to avoid
introduction of build issues and enable individual driver compilation.

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/20200310133121.27913-14-wambui.karugax@gmail.com

drivers/gpu/drm/omapdrm/omap_debugfs.c

@@ -82,29 +82,16 @@ static struct drm_info_list omap_dmm_debugfs_list[] = {
 
 int omap_debugfs_init(struct drm_minor *minor)
 {
-	struct drm_device *dev = minor->dev;
-	int ret;
-
-	ret = drm_debugfs_create_files(omap_debugfs_list,
+	drm_debugfs_create_files(omap_debugfs_list,
 				 ARRAY_SIZE(omap_debugfs_list),
 				 minor->debugfs_root, minor);
 
-	if (ret) {
-		dev_err(dev->dev, "could not install omap_debugfs_list\n");
-		return ret;
-	}
-
 	if (dmm_is_available())
-		ret = drm_debugfs_create_files(omap_dmm_debugfs_list,
+		drm_debugfs_create_files(omap_dmm_debugfs_list,
 					 ARRAY_SIZE(omap_dmm_debugfs_list),
 					 minor->debugfs_root, minor);
 
-	if (ret) {
-		dev_err(dev->dev, "could not install omap_dmm_debugfs_list\n");
-		return ret;
-	}
-
-	return ret;
+	return 0;
 }
 
 #endif