Fix compiler Warning about comparing different size types
Fix compiler Warning about comparing different size types

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

Closes: #1253
Approved by: vrothberg

ipbabble/buildah,rhatdan/buildah,TomSweeneyRedHat/buildah,projectatomic/buildah,TomSweeneyRedHat/buildah,ipbabble/buildah,rhatdan/buildah,projectatomic/buildah,TomSweeneyRedHat/buildah,nalind/buildah-1,nalind/buildah,projectatomic/buildah,nalind/buildah,nalind/buildah-1,rhatdan/buildah,nalind/buildah-1