Segmentation fault with Simple message logging

[Dmitry Bakshaev]

jabberd 2.2.16
gentoo linux
 ~700 users online

logging enabled in router.xml:
 <message_logging>
    <enabled/>
    <file>/var/log/jabber/message.log</file>
  </message_logging>

router crashed several times on the day:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000406950 in message_log (nad=0x654270, r=0x624010,
    msg_from=0x64db40 "<email address hidden>/Chelny-14",
    msg_to=0x6581c0 "<email address hidden>/SARATOV-4") at router.c:1158
1158 router.c: access denied.
        in router.c

attached patch fix this problem and slightly modified logging format:
1. ISO8601 timestamps
2. space as field delimiter
3. character 0x01 for replace line endings in messages (simple code)