To generate the patch for the given code slice, we need to follow a structured approach to identify the root cause of the vulnerability and then apply an appropriate fix. Here are the detailed reasoning steps:

### Step 1: Root Cause Analysis

1. **Understanding the Code Context:**
   - The function `ds2760_battery_remove` is responsible for cleaning up resources when a battery device is removed.
   - It performs several cleanup operations, such as canceling work queues and unregistering the power supply.

2. **Identifying the Vulnerability:**
   - The vulnerability identified is CWE-401: Memory Leak.
   - Memory leaks occur when allocated memory is not properly freed, leading to wasted memory resources and potential system instability.

3. **Analyzing the Code for Memory Allocation:**
   - The structure `ds2760_device_info` (`di`) is obtained using `platform_get_drvdata(pdev)`.
   - This structure is likely allocated dynamically (e.g., using `kmalloc` or similar functions) when the device is initialized.

4. **Checking for Memory Deallocation:**
   - The current code performs several cleanup operations but does not free the memory allocated for the `di` structure.
   - This omission results in a memory leak because the memory allocated for `di` is not released when the device is removed.

### Step 2: Fixing Strategy

1. **Ensuring Proper Memory Deallocation:**
   - To fix the memory leak, we need to ensure that the memory allocated for the `di` structure is freed before the function returns.

2. **Applying the Fix:**
   - The appropriate function to free dynamically allocated memory in the Linux kernel is `kfree`.
   - We need to call `kfree(di)` before returning from the function to ensure that the memory is properly deallocated.

### Conclusion

The root cause of the vulnerability is the failure to free the dynamically allocated memory for the `di` structure, leading to a memory leak. The fix involves adding a call to `kfree(di)` before the function returns.

### Patch

The patch to fix the memory leak is as follows:

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

### Explanation of the Patch

- The line `kfree(di);` is added before the `return 0;` statement.
- This ensures that the memory allocated for the `di` structure is properly freed, preventing the memory leak.

By following these reasoning steps, we can understand the root cause of the vulnerability and apply an appropriate fix to ensure that the memory is properly managed.