glusterd: fix memory corruption when probe fails

Change-Id: If161e9bebfd518b355aaf37af7805e804772dc2d
BUG: 893851
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: http://review.gluster.org/4372
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>