staging: r8188eu: EfuseUsedBytes is set but never used

The field EfuseUsedBytes of struct hal_data_8188e is set but never
used. Remove it.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220107215033.12257-6-straube.linux@gmail.com


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