btrfs: use GFP_KERNEL in btrfs_read_qgroup_config

The qgroup config is read during mount, we do not have to use NOFS.
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/qgroup.c

@@ -319,7 +319,7 @@ int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
 	if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
 		return 0;
 
-	fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
+	fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL);
 	if (!fs_info->qgroup_ulist) {
 		ret = -ENOMEM;
 		goto out;