chan_iax2.c: Avoid crash with IAX2 switch support.
A change made in 82cebaa0
did not properly handle the case when a
channel was not provided, triggering a crash. ast_check_hangup(...)
does not protect against NULL pointers.
Fixes #180
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@ -14323,7 +14323,7 @@ static struct iax2_dpcache *find_cache(struct ast_channel *chan, const char *dat
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ast_log(LOG_WARNING, "Timeout waiting for %s exten %s\n", data, exten);
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}
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if (ast_check_hangup(chan)) {
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if (chan && ast_check_hangup(chan)) {
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doabort = 1;
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}
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