Free history items at the end of use of the temporary SIP pvt structure. (issue #8383 reported by benh)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@47855 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -4297,6 +4297,7 @@ static int __transmit_response(struct sip_pvt *p, char *msg, struct sip_request
 static int transmit_response_using_temp(char *callid, struct sockaddr_in *sin, int useglobal_nat, const int intended_method, struct sip_request *req, char *msg)
 {
 	struct sip_pvt *p = alloca(sizeof(*p));
+	struct sip_history *hist = NULL;
 
 	memset(p, 0, sizeof(*p));
 
@@ -4322,6 +4323,11 @@ static int transmit_response_using_temp(char *callid, struct sockaddr_in *sin, i
 
 	__transmit_response(p, msg, req, 0);
 
+	while ((hist = p->history)) {
+		p->history = p->history->next;
+		free(hist);
+	}
+
 	return 0;
 }