Merge tag 'usb-serial-4.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/johan...

Johan writes:

USB-serial fixes for v4.9-rc2

Here's a fix for a NULL-deref during probe which could be triggered by a
malicious device, and a fix for some missing error handling in cp210x
that also leaked some bits from the stack. Included is also a new device
id for ftdi_sio.

Signed-off-by: Johan Hovold <johan@kernel.org>