usb: host: fotg210: remove unreachable code

Before running the platform_driver_unregister() the code will either return
retval or jump to clean. Removing this line that is unreachable.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>