core: add path route headers after local via

- minor header order fix: route header generated from recorded
  path are added after the local via if no other route headers are
  present in the message (they were added in front of the local
  via until now).

msg_translator.c

@@ -1563,6 +1563,7 @@ char * build_req_buf_from_sip_req( struct sip_msg* msg,
 	new_buf=0;
 	received_buf=0;
 	rport_buf=0;
+	via_anchor=0;
 	line_buf=0;
 	via_len=0;
 	path_buf.s=0;
@@ -1584,8 +1585,10 @@ char * build_req_buf_from_sip_req( struct sip_msg* msg,
 	branch.s=msg->add_to_branch_s;
 	branch.len=msg->add_to_branch_len;
 
+	via_anchor=anchor_lump(msg, msg->via1->hdr.s-buf, 0, HDR_VIA_T);
+	if (unlikely(via_anchor==0)) goto error00;
 	line_buf = create_via_hf( &via_len, msg, send_info, &branch);
-	if (!line_buf){
+	if (unlikely(!line_buf)){
 		LOG(L_ERR,"ERROR: build_req_buf_from_sip_req: "
 					"memory allocation failure\n");
 		goto error00;
@@ -1684,10 +1687,13 @@ after_update_via1:
 		memcpy(path_buf.s+ROUTE_PREFIX_LEN+msg->path_vec.len, CRLF, CRLF_LEN);
 		path_buf.s[path_buf.len]=0;
 		/* insert Route header either before the other routes
-		   (if present & parsed) or after the local via */
+		   (if present & parsed), after the local via or after in front of
+		    the first via if we don't add a local via*/
 		if (msg->route){
 			path_anchor=anchor_lump(msg, msg->route->name.s-buf, 0, 
 									HDR_ROUTE_T);
+		}else if (likely(via_anchor)){
+			path_anchor=via_anchor;
 		}else if (likely(msg->via1)){
 			path_anchor=anchor_lump(msg, msg->via1->hdr.s-buf, 0, 
 									HDR_ROUTE_T);
@@ -1755,8 +1761,6 @@ after_update_via1:
 	/* try to add it before msg. 1st via */
 	/* add first via, as an anchor for second via*/
 	if(likely(line_buf)) {
-		via_anchor=anchor_lump(msg, msg->via1->hdr.s-buf, 0, HDR_VIA_T);
-		if (via_anchor==0) goto error04;
 		if ((via_lump=insert_new_lump_before(via_anchor, line_buf, via_len,
 											HDR_VIA_T))==0)
 			goto error04;