Don't exit on invalid config lines, yet return a proper exit status.

newsyslog(8) is mainly used to proces log files, not rotating them
because of an invalid field means that /var will end up full.
Initially I wanted to ignore only getpwnam/getgrnam errors, but millert@
convinced me otherwise.  malloc(3) errors are still fatal.

Diff prompted by a report from Harald Dunkel, ok millert@

0 files changed, 0 insertions, 0 deletions