iotests: Fix test 156
On one hand, the _make_test_img invocation for creating the target image was missing a -u because its backing file is not supposed to exist at that point. On the other hand, nobody noticed probably because the backing file is created later on and _cleanup failed to remove it: The quotation marks were misplaced so bash tried to delete a file literally called "$TEST_IMG{,.target}..." instead of performing brace expansion. Thus, the files stayed around after the first run and qemu-img create did not complain about a missing backing file on any run but the first. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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