stripe: remove unused param, handle mem alloc failure

Change-Id: I9c27b1edab111031ca8eea9cc49480ea01e39089
BUG: 1002207
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/5716
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>