get rid of num parameter to sdp_replace

daemon/call.c

@@ -2224,7 +2224,7 @@ static const char *call_offer_answer_ng(bencode_item_t *input, struct callmaster
 	chopper = sdp_chopper_new(&sdp);
 	bencode_buffer_destroy_add(output->buffer, (free_func_t) sdp_chopper_destroy, chopper);
 	num = call_streams(call, &streams, &fromtag, opmode);
-	ret = sdp_replace(chopper, &parsed, call, num, opmode, &flags);
+	ret = sdp_replace(chopper, &parsed, call, (num >= 0) ? opmode : (opmode ^ 1), &flags);
 
 	mutex_unlock(&call->lock);
 	obj_put(call);

daemon/sdp.c

@@ -500,8 +500,7 @@ void sdp_chopper_destroy(struct sdp_chopper *chop) {
 
 /* XXX use stream numbers as index */
 /* XXX use port numbers as index */
-/* XXX get rid of num/off parameters? */
-int sdp_replace(struct sdp_chopper *chop, GQueue *sessions, struct call *call, int num,
+int sdp_replace(struct sdp_chopper *chop, GQueue *sessions, struct call *call,
 		enum call_opmode opmode, struct sdp_ng_flags *flags)
 {
 	struct sdp_session *session;
@@ -510,10 +509,6 @@ int sdp_replace(struct sdp_chopper *chop, GQueue *sessions, struct call *call, i
 	int off, skip;
 
 	off = opmode;
-	if (num < 0)
-		off ^= 1;
-	num = abs(num);
-
 	m = call->callstreams->head;
 
 	for (l = sessions->head; l; l = l->next) {

daemon/sdp.h

@@ -29,7 +29,7 @@ struct sdp_chopper {
 int sdp_parse(str *body, GQueue *sessions);
 int sdp_streams(const GQueue *sessions, GQueue *streams);
 void sdp_free(GQueue *sessions);
-int sdp_replace(struct sdp_chopper *, GQueue *, struct call *, int, enum call_opmode, struct sdp_ng_flags *);
+int sdp_replace(struct sdp_chopper *, GQueue *, struct call *, enum call_opmode, struct sdp_ng_flags *);
 
 struct sdp_chopper *sdp_chopper_new(str *input);
 void sdp_chopper_destroy(struct sdp_chopper *chop);