lib: ostream-file checks "sendfile() not supported" a bit better. There are other reasons why stream_errno=EINVAL could have been set, at least in theory.
lib: ostream-file checks "sendfile() not supported" a bit better.
There are other reasons why stream_errno=EINVAL could have been set, at
least in theory.

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