Staging: lustre: obdclass: Remove unnecessary return statements

This patch removes return statement which are not required.
The warning was detected by checkpatch.pl

WARNING: void function return statements are not generally useful

Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>