block: failed qemu-img command should return non-zero exit code
If the backing file cannot be opened when doing qemu-img rebase, the variable 'ret' was not assigned a non-zero value, and the qemu-img process terminated with exit code zero. Fix this. Signed-off-by: NXu Tian <xutian@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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