Added a return from the virtual status transfer software-triggered interrupt. Not entirely sure this is appropriate.

usb/device/targets/TARGET_NORDIC/TARGET_MCU_NRF52840/USBPhy_Nordic.cpp

@@ -634,6 +634,7 @@ void USBD_HAL_IRQHandler(void)
 		}
 
 		virtual_status_xfer_event = false;
+		return;
 	}
 	// Call Nordic driver IRQ handler
 	USBD_IRQHandler();