virtualkeyboard: fixed restart crash

src/add-ons/input_server/devices/virtualkeyboard/KeyboardLayoutView.cpp

@@ -1143,7 +1143,7 @@ void
 KeyboardLayoutView::_SendKeyDown(const Key* key)
 {
 	KID_CALLED();
-	
+
 	BMessage* message = new BMessage(B_KEY_DOWN);
 	message->AddInt64("when", system_time());
 	message->AddData("states", B_UINT8_TYPE, &fKeyState,
@@ -1171,4 +1171,5 @@ KeyboardLayoutView::_SendKeyDown(const Key* key)
 
 	if (fDevice->EnqueueMessage(message) != B_OK)
 		delete message;
+
 }

src/add-ons/input_server/devices/virtualkeyboard/VirtualKeyboardInputDevice.cpp

@@ -15,7 +15,6 @@ instantiate_input_device()
 
 VirtualKeyboardInputDevice::VirtualKeyboardInputDevice()
 {
-	fKeyboardWindow = new VirtualKeyboardWindow(this);
 }
 
 
@@ -39,6 +38,7 @@ VirtualKeyboardInputDevice::InitCheck()
 status_t
 VirtualKeyboardInputDevice::Start(const char* name, void* cookie)
 {
+	fKeyboardWindow = new VirtualKeyboardWindow(this);
 	fKeyboardWindow->Show();
 	return B_OK;
 }
@@ -47,7 +47,7 @@ VirtualKeyboardInputDevice::Start(const char* name, void* cookie)
 status_t
 VirtualKeyboardInputDevice::Stop(const char* name, void* cookie)
 {
-	if (fKeyboardWindow) {
+	if (fKeyboardWindow->Lock()) {
 		fKeyboardWindow->Quit();
 		fKeyboardWindow = NULL;
 	}