Claude review: drm/v3d: Fix vaddr leak when indirect CSD has zeroed workgroups

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Status: Good — correct and minimal fix.**

The bug: `v3d_rewrite_csd_job_wg_counts_from_indirect()` maps two BOs via `v3d_get_bo_vaddr()` at the top, but when any workgroup count is zero, it returned early via `return;`, skipping the `v3d_put_bo_vaddr()` cleanup at the bottom. This leaks the vaddr mappings.

The fix replaces the bare `return` with `goto unmap_bo`, jumping to a label placed just before the existing cleanup:

```c
	if (wg_counts[0] == 0 || wg_counts[1] == 0 || wg_counts[2] == 0)
-		return;
+		goto unmap_bo;
```

```c
+unmap_bo:
 	v3d_put_bo_vaddr(indirect);
 	v3d_put_bo_vaddr(bo);
```

This is the obvious correct fix. The `goto` is the standard kernel pattern for cleanup-on-early-exit. The Fixes tag correctly references the commit that introduced the indirect CSD path. Has Iago's Reviewed-by.

No issues.

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