fix leaked streams in case of incoming call declined because media incompatible

coreapi/linphonecall.c

@@ -762,6 +762,7 @@ void linphone_call_set_state(LinphoneCall *call, LinphoneCallState cstate, const
 static void linphone_call_destroy(LinphoneCall *obj)
 {
 	ms_message("Call [%p] freed.",obj);
+	linphone_call_stop_media_streams(obj);
 #ifdef BUILD_UPNP
 	linphone_call_delete_upnp_session(obj);
 #endif //BUILD_UPNP

coreapi/linphonecore.c

@@ -2852,6 +2852,7 @@ void linphone_core_notify_incoming_call(LinphoneCore *lc, LinphoneCall *call){
 	if (md){
 		if (sal_media_description_empty(md) || linphone_core_incompatible_security(lc,md)){
 			sal_call_decline(call->op,SalReasonMedia,NULL);
+			linphone_call_stop_media_streams(call);
 			linphone_core_del_call(lc,call);
 			linphone_call_unref(call);
 			return;