staging: r8188eu: remove redundant variable reg_0x143

Variable reg_0x143 is being assigned a value, however is not being
read. The variable is redundant and can be removed.

Reviewed-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220224230658.151338-1-colin.i.king@gmail.com


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