Remove assumption in res_pjsip_dtmf_info that all INFO messages will contain a body.

(closes issue ASTERISK-22320)
Reported by: Matt Jordan


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@396993 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_dtmf_info.c

@@ -39,14 +39,14 @@ static int dtmf_info_incoming_request(struct ast_sip_session *session, struct pj
 
 	pjsip_tx_data *tdata;
 
-	char buf[body->len];
+	char buf[body ? body->len : 0];
 	char *cur = buf;
 	char *line;
 
 	char event = '\0';
 	unsigned int duration = 0;
 
-	if (!ast_sip_is_content_type(&body->content_type, "application", "dtmf-relay")) {
+	if (!body || !ast_sip_is_content_type(&body->content_type, "application", "dtmf-relay")) {
 		return 0;
 	}