Fixes crash when calling twice end() (espressif#8332)

Author: SuGlider

cores/esp32/HWCDC.cpp

@@ -218,10 +218,10 @@ void HWCDC::setTxTimeoutMs(uint32_t timeout){
 
 size_t HWCDC::setTxBufferSize(size_t tx_queue_len){
  if(tx_ring_buf){
- if(!tx_queue_len){
-  vRingbufferDelete(tx_ring_buf);
-  tx_ring_buf = NULL;
-  }
+ vRingbufferDelete(tx_ring_buf);
+ tx_ring_buf = NULL;
+ }
+ if(!tx_queue_len){
  return 0;
  }
  tx_ring_buf = xRingbufferCreate(tx_queue_len, RINGBUF_TYPE_BYTEBUF);
@@ -319,19 +319,16 @@ void HWCDC::flush(void)
 
 size_t HWCDC::setRxBufferSize(size_t rx_queue_len){
  if(rx_queue){
- if(!rx_queue_len){
-  vQueueDelete(rx_queue);
-  rx_queue = NULL;
-  }
+ vQueueDelete(rx_queue);
+ rx_queue = NULL;
+ }
+ if(!rx_queue_len){
  return 0;
  }
  rx_queue = xQueueCreate(rx_queue_len, sizeof(uint8_t));
  if(!rx_queue){
  return 0;
  }
- if(!tx_ring_buf){
- tx_ring_buf = xRingbufferCreate(rx_queue_len, RINGBUF_TYPE_BYTEBUF);
- }
  return rx_queue_len;
 }