It is invalid to scsi_done(xs) and then return TRY_AGAIN_LATER.

scsi_done() can release the scsi_request xs and TRY_AGAIN_LATER will
refer to it and submit it for re-execution. This was being done only
if bus_dmamap_load() failed.

Ensure the controller resources are freed before returning
TRY_AGAIN_LATER, since new resources will be allocated when the
command is executed again.

Don't bother setting xs->error before returning TRY_AGAIN_LATER as the
code returned to sets xs->error to XS_BUSY.

ok marco@

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