qemu-img: Fix qemu-img convert -n If -n is specified, it does not matter whether the output format and protocol support image creation; building the creation options should simply be skipped. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 1423666727-20777-2-git-send-email-mreitz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>