STAGING: rtl8192u: fix checkpatch error about pointer position in r8190_rtl8256

This patch fixes the pointer position in r8190_rtl8256.h and r8190_rtl8256.c
to meet the kernel coding style conventions.

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