Memory leak (espressif#1672)

When a package of size 0 arrives, "buf" is created, but never released. (Sorry, that was my mistake in the last patch)

Author: Schuemi

libraries/WiFi/src/WiFiUdp.cpp

@@ -221,9 +221,10 @@ int WiFiUDP::parsePacket(){
  }
  remote_ip = IPAddress(si_other.sin_addr.s_addr);
  remote_port = ntohs(si_other.sin_port);
- if (len == 0) return 0;
- rx_buffer = new cbuf(len);
- rx_buffer->write(buf, len);
+ if (len > 0) {
+ rx_buffer = new cbuf(len);
+ rx_buffer->write(buf, len);
+ }
  delete[] buf;
  return len;
 }