staging: exfat: Fix parameter alignment issues

Fix alignment to match open parenthesis to comply in that way with
the preferred coding style for the linux kernel. Issue found by
checkpatch.

Suggested-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Frank A. Cancio Bello <frank@generalsoftwareinc.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Link: https://lore.kernel.org/r/fe316e694ea9c4aa370d3a8166a3680feb342682.1572666556.git.frank@generalsoftwareinc.com


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