chan_sip.c: Moved some sip_pvt unrefs after their last use.

* Moved sip_pvt unref in ast_hangup() and handle_request_do() to the end
of the function.  The unref needs to happen after the last use of the
pointer.
........

Merged revisions 412348 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 412383 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@412384 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -7154,10 +7154,11 @@ static int sip_hangup(struct ast_channel *ast)
 		sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT);
 		ast_clear_flag(&p->flags[0], SIP_DEFER_BYE_ON_TRANSFER);	/* Really hang up next time */
 		if (p->owner) {
-			ast_channel_tech_pvt_set(p->owner, dialog_unref(ast_channel_tech_pvt(p->owner), "unref p->owner->tech_pvt"));
 			sip_pvt_lock(p);
+			oldowner = p->owner;
 			sip_set_owner(p, NULL); /* Owner will be gone after we return, so take it away */
 			sip_pvt_unlock(p);
+			ast_channel_tech_pvt_set(oldowner, dialog_unref(ast_channel_tech_pvt(oldowner), "unref oldowner->tech_pvt"));
 		}
 		ast_module_unref(ast_module_info->self);
 		return 0;
@@ -7193,7 +7194,7 @@ static int sip_hangup(struct ast_channel *ast)
 	disable_dsp_detect(p);
 	sip_set_owner(p, NULL);
-	ast_channel_tech_pvt_set(ast, dialog_unref(ast_channel_tech_pvt(ast), "unref ast->tech_pvt"));
+	ast_channel_tech_pvt_set(ast, NULL);
 	ast_module_unref(ast_module_info->self);
 	/* Do not destroy this pvt until we have timeout or
@@ -7331,6 +7332,7 @@ static int sip_hangup(struct ast_channel *ast)
 		pvt_set_needdestroy(p, "hangup");
 	}
 	sip_pvt_unlock(p);
+	dialog_unref(p, "unref ast->tech_pvt");
 	return 0;
 }
@@ -28259,12 +28261,12 @@ static int handle_request_do(struct sip_request *req, struct ast_sockaddr *addr)
 		ast_channel_unref(owner_chan_ref);
 	}
 	sip_pvt_unlock(p);
-	ao2_t_ref(p, -1, "throw away dialog ptr from find_call at end of routine"); /* p is gone after the return */
 	ast_mutex_unlock(&netlock);
 	if (p->logger_callid) {
 		ast_callid_threadassoc_remove();
 	}
+	ao2_t_ref(p, -1, "throw away dialog ptr from find_call at end of routine"); /* p is gone after the return */
 	return 1;
 }