res_pjsip_transport_websocket: Fix crash when the Contact header is not a URI.

The code for changing the Contact header wrongly assumed that the Contact
would always contain a URI. This is incorrect.

ASTERISK-24271
Reported by: Dafi Ni
........

Merged revisions 422557 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@422558 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_transport_websocket.c

@@ -322,7 +322,7 @@ static pj_bool_t websocket_on_rx_msg(pjsip_rx_data *rdata)
 		return PJ_FALSE;
 	}
 
-	if ((contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, NULL)) &&
+	if ((contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, NULL)) && !contact->star &&
 		(PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) {
 		pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri);