staging: rtl8192u: Add space to fix style issue

This patch fixes the file r8190_rtl8256.c to avoid the following
checkpatch.pl warnings:
	CHECK: spaces preferred around that '>>' (ctx:VxV)

Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Link: https://lore.kernel.org/r/20200209073020.13423-1-sylphrenadin@gmail.com


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