quota: Avoid assert-crash in Maildir++ quota if backend doesn't support control dirs. We'll delay looking up the control dir until we've checked that the storage is Maildir.
quota: Avoid assert-crash in Maildir++ quota if backend doesn't support control dirs.
We'll delay looking up the control dir until we've checked that the storage
is Maildir.

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot