Staging: lustre: Fix return in void function warning

This fixes checkpatch.pl warning:

WARNING: void function return statements are not generally useful

Signed-off-by: Darshana Padmadas <darshanapadmadas@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>