USB: core: drop short-transfer check from usb_control_msg_send()

A failure to send a complete control message is always an error so
there's no need to check for short transfers in usb_control_msg_send().

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20201204085110.20055-3-johan@kernel.org


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