This driver report connection speed over sas port speed. On stable/13 branch the stack-allocated CCB is not cleared thus on boot the the cam layer may report wrong speed. -current and stable/14 are not affected, but I want current and stable/14 to have this to reduce drift between branches.
```
da0: <VMware Virtual disk 2.0> Fixed Direct Access SPC-4 SCSI device
da0: 4294967.295MB/s transfers
```
MFC after: 1 week