staging: kpc2000: clean up after probe failure.

- the kpc_spi driver doesn't seem to let multiple transactions (to different instances of the core) happen in parallel...

- The kpc_i2c driver is a hot mess, it should probably be cleaned up a ton.  It functions against current hardware though.

- pcard->card_num in kp2000_pcie_probe() is a global variable and needs atomic / locking / something better.

- the loop in kp2000_probe_cores() that uses probe_core_uio() also probably needs error handling

- would be nice if the AIO fileops in kpc_dma could be made to work

    - probably want to add a CONFIG_ option to control compilation of the AIO functions

- if the AIO fileops in kpc_dma start working, next would be making iov_count > 1 work too

                dev_err(&pcard->pdev->dev,

                        "kp2000_probe_cores: failed to add core %d: %d\n",

                        i, err);

                return err;

                goto error;

            }

            core_num++;

        }

    err = probe_core_uio(0, pcard, "kpc_uio", cte);

    if (err){

        dev_err(&pcard->pdev->dev, "kp2000_probe_cores: failed to add board_info core: %d\n", err);

        return err;

        goto error;

    }

    return 0;

error:

    kp2000_remove_cores(pcard);

    mfd_remove_devices(PCARD_TO_DEV(pcard));

    return err;

}

void  kp2000_remove_cores(struct kp2000_device *pcard)