block: qemu-iotests, fix _make_test_img() to work with spaced pathnames
_make_test_img() currently works with spaced pathnames only when not specifying a backing file. This fixes it so that the backing file argument is properly quoted. Signed-off-by: NJeff Cody <jcody@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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