Fix a typo in a variable name unuused -> unused

Change-Id: I09cd74173642bcaeb94fb3528485f912e6f56434
Signed-off-by: Martin Sivak <msivak@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/17217
Reviewed-by: Doron Fediuck <dfediuck@redhat.com>
Reviewed-by: Adam Litke <agl@us.ibm.com>
Tested-by: Adam Litke <agl@us.ibm.com>