staging: rtl8192u: remove unused variable

Fix the following gcc warning:

drivers/staging/rtl8192u/r8192U_core.c:3419:6: warning: variable
‘reset_status’ set but not used [-Wunused-but-set-variable].

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/1617775650-42645-1-git-send-email-jiapeng.chong@linux.alibaba.com


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