staging: exfat: exfat_super.c: remove commented out function

Remove function ffsSetAttr() which is unused.

Signed-off-by: Lourdes Pedrajas <lu@pplo.net>
Link: https://lore.kernel.org/r/20200309165801.4827-1-lu@pplo.net


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