staging: r8188eu: remove rtw_usb_control_msg() macro

It is a wrapper around usb_control_msg() that does nothing, so remove
the macro and just call the correct USB function instead in the one
place it is used.

Link: https://lore.kernel.org/r/20210730092417.1014392-12-gregkh@linuxfoundation.org


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