staging: lustre: lov_pool: Fixed a return coding style warning.

Remove unusefull return at the end of void function.
WARNING: void function return statements are not generally useful.

Signed-off-by: Rakhi Sharma <rakhish1994@gmail.com>

Changes in v3:
  shortened the subject line and make the discription more clear.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>