Merge tag 'usb-serial-5.4-rc2' of https://git.kernel.org/pub/scm/linux/kernel/git...

Merge tag 'usb-serial-5.4-rc2' of https://git./linux/kernel/git/johan/usb-serial into usb-linus

Johan writes:

USB-serial fixes for 5.4-rc2

Here's a fix for a long-standing issue in the keyspan driver which could
lead to NULL-pointer dereferences when a device had unexpected endpoint
descriptors.

Included are also some new device IDs.

All but the last two commits have been in linux-next with no reported
issues.

Signed-off-by: Johan Hovold <johan@kernel.org>
* tag 'usb-serial-5.4-rc2' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial:
  USB: serial: keyspan: fix NULL-derefs on open() and write()
  USB: serial: option: add support for Cinterion CLS8 devices
  USB: serial: option: add Telit FN980 compositions
  USB: serial: ftdi_sio: add device IDs for Sienna and Echelon PL-20