fosquitto: fails to start in HBD

Syslog from Omnia HBD

Apr 20 14:59:58 turris mosquitto[8448]: 1618930798: The 'port' option is now deprecated and will be removed in a future version. Please use 'listener' instead.
Apr 20 14:59:58 turris mosquitto[8448]: 1618930798: The 'bind_address' option is now deprecated and will be removed in a future version. The behaviour will default to true.
Apr 20 14:59:58 turris mosquitto[8448]: 1618930798: Error: Unable to open pwfile "/etc/fosquitto/credentials.hashed".
Apr 20 14:59:58 turris mosquitto[8448]: 1618930798: Error opening password file "/etc/fosquitto/credentials.hashed".
Apr 20 14:59:58 turris procd: Instance fosquitto::instance1 s in a crash loop 27 crashes, 0 seconds since last crash

Changing owner to mosquitto user for the following files fixed the issue.

/etc/fosquitto/credentials.hashed
/etc/fosquitto/credentials.plain