clean compiler warning.

osal/usb_osal_freertos.c

@@ -145,4 +145,4 @@ void usb_osal_leave_critical_section(uint32_t flag)
 void usb_osal_msleep(uint32_t delay)
 {
     vTaskDelay(pdMS_TO_TICKS(delay));
-}
+}

osal/usb_osal_rtthread.c

@@ -114,4 +114,4 @@ void usb_osal_leave_critical_section(uint32_t flag)
 void usb_osal_msleep(uint32_t delay)
 {
     rt_thread_mdelay(rt_tick_from_millisecond(delay));
-}
+}

osal/usb_workq.h

@@ -46,4 +46,4 @@ extern struct usb_workqueue g_lpworkq;
 
 void usb_workqueue_submit(struct usb_workqueue *queue, struct usb_work *work, usb_worker_t worker, void *arg, uint32_t ticks);
 int usbh_workq_initialize();
-#endif
+#endif