fix(PISerial): close fd when probe read fails in availableDevicesInfo

When the non-blocking probe read returned EIO, the loop continued
without closing the file descriptor, leaking one fd per rejected
port on each call.

libs/main/io_devices/piserial.cpp

@@ -1292,6 +1292,11 @@ PIVector<PISerial::DeviceInfo> PISerial::availableDevicesInfo(bool test) {
 			if (!rok) {
 				ret.remove(i);
 				--i;
+#ifdef WINDOWS
+				CloseHandle(hComm);
+#else
+				::close(fd);
+#endif
 				continue;
 			}
 #ifdef WINDOWS