drm/nouveau: make nouveau_drm_debugfs_init() return 0

Since 987d65d0 (drm: debugfs: make
drm_debugfs_create_files() never fail), there is no need to ever check
for the the return value of debugfs_create_file() and
drm_debugfs_create_files(). Therefore, remove unnecessary checks and
error handling in nouveau_drm_debugfs_init() and have the function
return 0 directly.

v2: have nouveau_drm_debugfs_init() return 0 instead of void so as not
to introduce any build warnings to enable individual patch 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/20200310133121.27913-12-wambui.karugax@gmail.com

drivers/gpu/drm/nouveau/nouveau_debugfs.c

@@ -222,22 +222,18 @@ nouveau_drm_debugfs_init(struct drm_minor *minor)
 {
 	struct nouveau_drm *drm = nouveau_drm(minor->dev);
 	struct dentry *dentry;
-	int i, ret;
+	int i;
 
 	for (i = 0; i < ARRAY_SIZE(nouveau_debugfs_files); i++) {
-		dentry = debugfs_create_file(nouveau_debugfs_files[i].name,
+		debugfs_create_file(nouveau_debugfs_files[i].name,
 				    S_IRUGO | S_IWUSR,
 				    minor->debugfs_root, minor->dev,
 				    nouveau_debugfs_files[i].fops);
-		if (!dentry)
-			return -ENOMEM;
 	}
 
-	ret = drm_debugfs_create_files(nouveau_debugfs_list,
+	drm_debugfs_create_files(nouveau_debugfs_list,
 				 NOUVEAU_DEBUGFS_ENTRIES,
 				 minor->debugfs_root, minor);
-	if (ret)
-		return ret;
 
 	/* Set the size of the vbios since we know it, and it's confusing to
 	 * userspace if it wants to seek() but the file has a length of 0