Merge tag 'usb-serial-4.18-rc4' of...

Merge tag 'usb-serial-4.18-rc4' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial

 into usb-linus

USB-serial fixes for v4.18-rc4

Here are three fixes for broken control-transfer error handling, which
could lead to uninitialised slab data leaking to user space.

Included is also a new device id for cp210x.

All but the final two patches have been in linux-next with no reported
issues.

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