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4ed4483bbc
Before this change a panic could be overwritten with the message
fatal error: sync: unlock of unlocked mutex
This was because we temporarily unlocked the mutex, but failed to lock
it again if there was a panic.
This is code is never the cause of an error but it masks the
underlying error by overwriting the panic cause.
See: https://forum.rclone.org/t/serve-webdav-is-crashing-fatal-error-sync-unlock-of-unlocked-mutex/46300