[draft] ensure libusb is initialized

Author: cmaglie

main.go

@@ -85,10 +85,14 @@ func (d *DFUDiscovery) Stop() error {
 }
 
 // StartSync is the handler for the pluggable-discovery START_SYNC command
-func (d *DFUDiscovery) libusbSync(eventCB discovery.EventCallback, errorCB discovery.ErrorCallback) error {
-	if cErr := C.libusbOpen(); cErr != nil {
-		return fmt.Errorf("can't open libusb: %s", C.GoString(cErr))
+func (d *DFUDiscovery) StartSync(eventCB discovery.EventCallback, errorCB discovery.ErrorCallback) error {
+	if err := d.libusbOpen(); err != nil {
+		return err
 	}
+	return d.sync(eventCB, errorCB)
+}
+
+func (d *DFUDiscovery) libusbSync(eventCB discovery.EventCallback, errorCB discovery.ErrorCallback) error {
 	if err := C.libusbHotplugRegisterCallback(); err != nil {
 		return errors.New(C.GoString(err))
 	}

sync_unix.go

@@ -24,7 +24,6 @@ import (
 	discovery "github.com/arduino/pluggable-discovery-protocol-handler/v2"
 )
 
-// StartSync is the handler for the pluggable-discovery START_SYNC command
-func (d *DFUDiscovery) StartSync(eventCB discovery.EventCallback, errorCB discovery.ErrorCallback) error {
+func (d *DFUDiscovery) sync(eventCB discovery.EventCallback, errorCB discovery.ErrorCallback) error {
 	return d.libusbSync(eventCB, errorCB)
 }

sync_windows.go

@@ -26,8 +26,7 @@ import (
 	discovery "github.com/arduino/pluggable-discovery-protocol-handler/v2"
 )
 
-// StartSync is the handler for the pluggable-discovery START_SYNC command
-func (d *DFUDiscovery) StartSync(eventCB discovery.EventCallback, errorCB discovery.ErrorCallback) error {
+func (d *DFUDiscovery) sync(eventCB discovery.EventCallback, errorCB discovery.ErrorCallback) error {
 	ctx, cancel := context.WithCancel(context.Background())
 	d.close = cancel