Connected new ulp_info parameter in usrsctp send callback

src/sctptransport.cpp

@@ -718,15 +718,8 @@ int SctpTransport::RecvCallback(struct socket *sock, union sctp_sockstore addr,
 	return ret;
 }
 
-int SctpTransport::SendCallback(struct socket *sock, uint32_t sb_free, void *ulp_info) {
-	struct sctp_paddrinfo paddrinfo = {};
-	socklen_t len = sizeof(paddrinfo);
-	if (usrsctp_getsockopt(sock, IPPROTO_SCTP, SCTP_GET_PEER_ADDR_INFO, &paddrinfo, &len))
-		return -1;
-
-	auto sconn = reinterpret_cast<struct sockaddr_conn *>(&paddrinfo.spinfo_address);
-	void *ptr = sconn->sconn_addr;
-	auto *transport = static_cast<SctpTransport *>(ptr);
+int SctpTransport::SendCallback(struct socket *, uint32_t sb_free, void *ulp_info) {
+	auto *transport = static_cast<SctpTransport *>(ulp_info);
 
 	std::shared_lock lock(InstancesMutex);
 	if (Instances.find(transport) == Instances.end())