Staging:Android:ion - Fix for memory leak if ion device registration get failed.

Fix to avoid possible memory leak if the ion device registration
get failed.Free the allocated device creation memory before return
in case the ion device registration get failed.
Signed-off-by: Shailendra Verma <shailendra.capricorn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/ion.c

@@ -1579,6 +1579,7 @@ struct ion_device *ion_device_create(long (*custom_ioctl)
 	ret = misc_register(&idev->dev);
 	if (ret) {
 		pr_err("ion: failed to register misc device.\n");
+		kfree(idev);
 		return ERR_PTR(ret);
 	}