Staging: lustre: lustre: osc: Changed the return code of a function from int to void.

The following patch changes the return code of a function from int to void
as the return value was not used by the callers.

Signed-off-by: Heena Sirwani <heenasirwani@gmail.com>
Reviewed-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>