staging: r8188eu: add missing blank line after declarations

Add a missing blank line after declarations in rtw_macaddr_cfg()
to clear a checkpatch warning.

WARNING: Missing a blank line after declarations

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210830121508.6411-8-straube.linux@gmail.com


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