rem: if (driver->PrinterSetup(printerName) == B_OK) {
add: st = driver->PrinterSetup(printerName); delete driver; if (st == B_OK) {
context: add_printer(char *printerName){	PrinterDriver* driver;	driver = instanciate_driver(NULL);	if (driver->PrinterSetup(printerName) == B_OK) {		return printerName; 	} else {		return NULL;	}}