imagebuildah: omit comparison to bool
imagebuildah: omit comparison to bool

Reported by golangci-lint.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

Closes: #1678
Approved by: rhatdan

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