staging: gasket: core: Fix a coding style issue in gasket_core.c

A coding alignment issue is found by checkpatch.pl.
Fix it by using a temporary for gasket_dev->bar_data[bar_num].

Signed-off-by: Zhixu Zhao <zhixu001@126.com>
Link: https://lore.kernel.org/r/20200715133313.16327-1-zhixu001@126.com


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