


Q: Given the following code slice:
```
1 static int ds2760_battery_remove(struct platform_device *pdev)
3     struct ds2760_device_info *di = platform_get_drvdata(pdev);
4     cancel_rearming_delayed_workqueue(di->monitor_wqueue, &di->monitor_work);
5     cancel_rearming_delayed_workqueue(di->monitor_wqueue, &di->set_charged_work);
6     destroy_workqueue(di->monitor_wqueue);
7     power_supply_unregister(&di->bat);
8     return 0;```
which has a CWE-457 vulnerability at line:
```
8     return 0;
```
Please generate the patch for the vulnerability. Please follow the patch format in the exemplars.
The patching can be done in two steps.

Step 1. Root Cause Analysis: The vulnerability CWE-401 (Improper Release of Memory Before Removing Last Reference) exists in the given code because the memory allocated for the `struct ds2760_device_info *di` is not properly freed before the function returns. The `di` structure is likely allocated dynamically during the initialization or probe function of the device driver, and it should be freed when the device is removed to avoid memory leaks.

Step 2. Fixing Strategy: To fix the vulnerability, the patch needs to free the dynamically allocated memory for `di` before returning from the `ds2760_battery_remove` function. This can be done by adding a `kfree(di)` statement before the `return 0;` line. The patch should be:

```
<     power_supply_unregister(&di->bat);
<     return 0;
---
>     power_supply_unregister(&di->bat);
>     kfree(di);
>     return 0;
```

By adding `kfree(di)`, the memory allocated for the `struct ds2760_device_info *di` is properly released, preventing the memory leak and fixing the CWE-401 vulnerability.