Removed nonsensical comment.
The function may return many values besides success.
Change syslog() format string handling to remove clang warning.
pam_dovecotmd5pwd.c:85:29: warning: format string is not a string literal
      (potentially insecure) [-Wformat-security]
            syslog(LOG_ERR, buf);
Merge pull request #1 from thuovila/master

Some small changes to pam_dovecotmd5pwd