Merge tag 'usb-serial-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...

Johan writes:

USB-serial updates for v4.13-rc1

Here are the USB-serial updates for 4.13, including support for
manipulating the modem-control signals of qcserial devices, propagation
of errnos after late probe errors from usb-serial core, and a couple of
clean ups.

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

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