Fix encoding of STUN ERROR-CODE attribute. #13
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When encode_error_code is invoked with a reason, for example
"Role Conflict", the reason ERROR-CODE attribute is encoded
with incorrect padding (always 0 bytes of padding).
The reason is that the padding calculation is done before the strlen()
call to determine the reason length.
This was discovered while investigating a FreeSwitch crash:
https://freeswitch.org/jira/browse/FS-10394