Use NO_CCB when we run out of work units.  This way we don't have to care about having enough WU + CCB during rebuilds.  This also brings softraid closer to behaving like the other SCSI devices.
Use NO_CCB when we run out of work units.  This way we don't have to care
about having enough WU + CCB during rebuilds.  This also brings softraid
closer to behaving like the other SCSI devices.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars