LU-3063 osc: Check return code for lu_kmem_init

LU-3063 osc: Check return code for lu_kmem_init

lu_kmem_init can fail and returns has a return code.
Check for this return code in lu_kmem_init.

This issue was found during 2gb VM Racer testing

Signed-off-by: Keith Mannthey <keith.mannthey@intel.com>
Change-Id: I4ca9d5bae212591d5109b2053940161f9e28baeb
Reviewed-on: http://review.whamcloud.com/6514
Tested-by: Hudson
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/7388