Fix crash during destruction of second channel when variable set with setvar.
The setvar line in chan_dahdi.conf is shared among all the channels, so make sure to only free the resources only when the last channel is destroyed. (closes issue #15899) Reported by: tzafrir git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@222298 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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@ -4881,8 +4881,9 @@ static void destroy_dahdi_pvt(struct dahdi_pvt *pvt)
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ast_smdi_interface_unref(p->smdi_iface);
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if (p->mwi_event_sub)
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ast_event_unsubscribe(p->mwi_event_sub);
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if (p->vars)
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if (p->vars && iflist && !iflist->next) {
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ast_variables_destroy(p->vars);
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}
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ast_mutex_destroy(&p->lock);
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dahdi_close_sub(p, SUB_REAL);
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if (p->owner)
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