Matt Jacob f77e6d9569 If we get a DATA UNDERRUN error from QLogic FC cards, but the RQCS_RU bit
is not set in the scsi completion status, or if the residual is clearly
nonsense, then this was a command that suffered the loss of one or more
FC frames in the middle of the exchange.

Set HBA_BOTCH and hope it will get retried. It's the only thing we can do.

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