imm.c: spelling
scsi.h: remove old and now incorrect comment
scsi_scan.c: remove superfluous final return
scsi_error.c: apart from similar trivialities the only change:

    If a command fails (e.g. because it belongs to a newer
    SCSI version than the device), it is fed to
    scsi_decide_disposition(). That routine must return
    SUCCESS, unless the error handler should be invoked.

    In the situation where host_byte is DID_OK, and message_byte
    is COMMAND_COMPLETE, and status is CHECK_CONDITION, there is
    no reason at all to invoke aborts and resets. The situation
    is normal. I see here UNIT ATTENTION, Power on occurred
    and ILLEGAL REQUEST, Invalid field in cdb.

    The 2.5.64 code does not return SUCCESS, but it returns the
    return code of scsi_check_sense(), and that may be FAILED
    in case we do not have valid sense.