USB: serial: ch341: fix open and resume after B0

USB: serial: ch341: fix open and resume after B0

The private baud_rate variable is used to configure the port at open and
reset-resume and must never be set to (and left at) zero or reset-resume
and all further open attempts will fail.

Fixes: 45b4e389ce1e ("USB: ch341: set tty baud speed according to tty
struct")
Fixes: eb0df4e027fb ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>