lib: Never implicitly clear istream's stream_errno. I'm not really sure why these were added in the first place. At some point the stream_errno was cleared in more places, such as just before reading, but those were also removed already. I don't see any benefit for these, just potential problems.
lib: Never implicitly clear istream's stream_errno.
I'm not really sure why these were added in the first place. At some point
the stream_errno was cleared in more places, such as just before reading,
but those were also removed already. I don't see any benefit for these, just
potential problems.

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