PJSIP: Fix assert on initial mass qualify

This fixes the MWI test regressions caused by r429127 and ensures that
contacts have non-zero qualify_frequency before attempting scheduling.


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@429245 f38db490-d61c-443f-a65b-d21fe96a405b
res_http_websocket: Fix crash due to double freeing memory when receiving a payload length of zero.

Frames with a payload length of 0 were incorrectly handled in res_http_websocket.
Provided a frame with a payload had been received prior it was possible for a double
free to occur. The realloc operation would succeed (thus freeing the payload) but be
treated as an error. When the session was then torn down the payload would be
freed again causing a crash. The read function now takes this into account.

This change also fixes assumptions made by users of res_http_websocket. There is no
guarantee that a frame received from it will be NULL terminated.

ASTERISK-24472 #close
Reported by: Badalian Vyacheslav

Review: https://reviewboard.asterisk.org/r/4220/
Review: https://reviewboard.asterisk.org/r/4219/
........

Merged revisions 429270 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@429272 f38db490-d61c-443f-a65b-d21fe96a405b