staging: r8188eu: core: remove unused variable local variable

Remove unused local variable macAddr.

Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/YVhpBWhNt7mwfNKU@user


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