Merge tag 'usb-serial-6.14-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel...

Merge usb-serial updates from Johan:

USB-serial updates for 6.14-rc1

Here are the USB-serial updates for 6.14-rc1, including:

 - fix a long-standing NULL-deref issue in quatech2
 - add support for hardware flow control to ch341

Included is also a related clean up.

All have been in linux-next with no reported issues.

* tag 'usb-serial-6.14-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial:
  USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()
  USB: serial: ch341: use fix-width types consistently
  USB: serial: ch341: add hardware flow control RTS/CTS