staging: kpc2000: clean up after probe failure.

On error, kp2000_probe_cores just returned an error without freeing
resources which had previously been allocated.  Added the missing
clean-up code.

Updated TODO.
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/kpc2000/TODO

 - 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

drivers/staging/kpc2000/kpc2000/cell_probe.c

@@ -438,7 +438,7 @@ int  kp2000_probe_cores(struct kp2000_device *pcard)
                 dev_err(&pcard->pdev->dev,
                         "kp2000_probe_cores: failed to add core %d: %d\n",
                         i, err);
-                return err;
+                goto error;
             }
             core_num++;
         }
@@ -457,10 +457,15 @@ int  kp2000_probe_cores(struct kp2000_device *pcard)
     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)