staging: exfat: make alignment match open parenthesis

Fix checkpatch.pl warning:

	CHECK: Alignment should match open parenthesis
Signed-off-by: Roi Martin <jroi.martin@gmail.com>
Link: https://lore.kernel.org/r/20191030010328.10203-3-jroi.martin@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>