blockdev: fix drive-mirror 'granularity' error message
Name the 'granularity' parameter and give its expected value range. Previously the device name was mistakenly reported as the parameter name. Note that the error class is unchanged from ERROR_CLASS_GENERIC_ERROR. Reported-by: NEric Blake <eblake@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NBenoît Canet <benoit.canet@nodalink.com>
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