qemu-img: round down request length to an aligned sector
this patch shortens requests to end at an aligned sector so that the next request starts aligned. [Squashed Peter's fix for bdrv_get_info() failure discussed on the mailing list. --Stefan] Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NPeter Lieven <pl@kamp.de> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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