res_pjsip: On partial transport reload also move factories.

For connection oriented transports PJSIP uses factories to
produce transports. When doing a partial transport reload
we need to also move the factory of the transport over so
that anything referencing the transport (such as an endpoint)
has the factory available.

ASTERISK-29441

Change-Id: Ieae0fb98eab2d9257cad996a1136e5a62d307161

res/res_pjsip/config_transport.c

@@ -559,6 +559,8 @@ static int transport_apply(const struct ast_sorcery *sorcery, void *obj)
 		ast_log(LOG_WARNING, "Transport '%s' is not fully reloadable, not reloading: protocol, bind, TLS, TCP, ToS, or CoS options.\n", transport_id);
 		temp_state->state->transport = perm_state->state->transport;
 		perm_state->state->transport = NULL;
+		temp_state->state->factory = perm_state->state->factory;
+		perm_state->state->factory = NULL;
 		res = PJ_SUCCESS;
 	} else if (transport->type == AST_TRANSPORT_UDP) {
 		for (i = 0; i < BIND_TRIES && res != PJ_SUCCESS; i++) {