[sr-dev] Crash bug if Via header removed + changes applied

[Alex Balashov]

Don't ask me why anyone would want to do this, but, for simple stateful 
relay scenario:

    UAC --> Kamailio --> UAS

This:

    remove_hf("Via");
    msg_apply_changes();

will crash Kamailio:

Feb 10 18:54:22 diminuendo-1 /usr/local/sbin/kamailio[30982]: ERROR: tm 
[t_lookup.c:540]: ERROR: t_lookup_request: no via
Feb 10 18:54:22 diminuendo-1 /usr/local/sbin/kamailio[30981]: ALERT: 
<core> [main.c:741]: child process 30982 exited by a signal 11


-- 
Alex Balashov - Principal
Evariste Systems LLC
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