drm/nouveau: remove checks for return value of debugfs functions

As there is no need to check for the return value of debugfs_create_file
and drm_debugfs_create_files, remove unnecessary checks and error
handling in nouveau_drm_debugfs_init.
Signed-off-by: Wambui Karuga <wambui.karugax@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.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