coverity report data leak

[danielwangksu]

When if (rmw_serialized_message_resize(serialized_message, data_length) != RMW_RET_OK) take the true branch tss will not be released

rmw_fastrtps/rmw_fastrtps_cpp/src/rmw_serialize.cpp

Lines 43 to 48 in 62b7534

	auto tss = new MessageTypeSupport_cpp(callbacks);
	auto data_length = tss->getEstimatedSerializedSize(ros_message);
	if (serialized_message->buffer_capacity < data_length) {
	if (rmw_serialized_message_resize(serialized_message, data_length) != RMW_RET_OK) {
	RMW_SET_ERROR_MSG("unable to dynamically resize serialized message");
	return RMW_RET_ERROR;

Same for if (rmw_serialized_message_resize(serialized_message, data_length) != RMW_RET_OK)

rmw_fastrtps/rmw_fastrtps_dynamic_cpp/src/rmw_serialize.cpp

Lines 42 to 47 in 62b7534

	auto tss = _create_message_type_support(ts->data, ts->typesupport_identifier);
	auto data_length = tss->getEstimatedSerializedSize(ros_message);
	if (serialized_message->buffer_capacity < data_length) {
	if (rmw_serialized_message_resize(serialized_message, data_length) != RMW_RET_OK) {
	RMW_SET_ERROR_MSG("unable to dynamically resize serialized message");
	return RMW_RET_ERROR;

[clalancette]

This was actually fixed by #590 and #350, so closing.