Update USBCDC.cpp to fulfill A style

Author: cyliangtw

drivers/usb/source/USBCDC.cpp

@@ -388,7 +388,7 @@ void USBCDC::send_nb(uint8_t *buffer, uint32_t size, uint32_t *actual, bool now)
         }
         _tx_size += write_size;
         *actual = write_size;
-        if((CDC_MAX_PACKET_SIZE == size) && (CDC_MAX_PACKET_SIZE == write_size)) {
+        if ((CDC_MAX_PACKET_SIZE == size) && (CDC_MAX_PACKET_SIZE == write_size)) {
             _trans_zlp = true;
         }
         if (now) {
@@ -407,7 +407,7 @@ void USBCDC::_send_isr_start()
         if (USBDevice::write_start(_bulk_in, _tx_buffer, _tx_size)) {
             _tx_in_progress = true;
         }
-    } else if(!_tx_in_progress && _trans_zlp) {
+    } else if (!_tx_in_progress && _trans_zlp) {
         if (USBDevice::write_start(_bulk_in, _tx_buffer, 0)) {
             _tx_in_progress = true;
             _trans_zlp = false;