staging/lustre/llite: Get rid of OBD_ALLOC/FREE_PTR

The remaining users in ll_open_cleanup and obd_mod_alloc
are converted to regular kzalloc/kfree.

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>