db/simple: fix crash when mounting twice
The `db->close()` call was a `nullptr` dereference because the `db` variable had already been moved. Closes https://github.com/MusicPlayerDaemon/MPD/issues/839
This commit is contained in:
The `db->close()` call was a `nullptr` dereference because the `db` variable had already been moved. Closes https://github.com/MusicPlayerDaemon/MPD/issues/839