USB: cdc-acm: drop redundant driver-data assignment

The interface driver data has already been set by
usb_driver_claim_interface() so drop the redundant subsequent
assignment.

Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210322155318.9837-4-johan@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>