btrfs-progs: rescue: properly close the fs for clear-ino-cache

[BUG]
In cmd_rescue_clear_ino_cache(), we opened the fs, but without
closing it using close_ctree().

[CAUSE]

This was introduced in 42404a4e44 ("btrfs-progs: move inode cache
removal to rescue group"), the original code inside btrfs check
had a "goto out_close;" to properly close the fs.

[FIX]
Manually call close_ctree() on the fs_info->tree_root.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

cmds/rescue.c

@@ -451,6 +451,7 @@ static int cmd_rescue_clear_ino_cache(const struct cmd_struct *cmd,
 	} else {
 		pr_verbose(LOG_DEFAULT, "Successfully cleared ino cache");
 	}
+	close_ctree(fs_info->tree_root);
 out:
 	return !!ret;
 }