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This driver prefers connection speed over sas port speed. On stable/13
branch the stack-allocated CCB is not cleared thus the cam layer may
report weird speed on boot.
```
da0: <VMware Virtual disk 2.0> Fixed Direct Access SPC-4 SCSI device
da0: 4294967.295MB/s transfers
```
-current and stable/14 have the change [1] which clears stack-allocated
CCB thus are not affected, but I want -current and stable/14 to have this
fix in to reduce drift between branches.
1. ec5325dbca cam: make sure to clear even more CCBs allocated on the stack
Reviewed by: imp
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D48438