STAGING: rtl8192u: fix checkpatch error about pointer position in r8192U.h

This patch fixes the pointer position in r8192U.h
to meet the kernel coding style conventions.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>