Claude review: drm/exec, drm/xe, drm/amdgpu: Add an accessor for struct drm_exec::ticket

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

Patch Review

**Bug: The amdkfd changes won't compile.**

In `amdgpu_amdkfd_gpuvm.c`, `exec` is declared as `struct drm_exec exec;` (a local struct, not a pointer). The patch changes:

```c
-	ret = process_validate_vms(process_info, &exec.ticket);
+	ret = process_validate_vms(process_info, drm_exec_ticket(exec));
```

Since `drm_exec_ticket()` takes `struct drm_exec *`, this should be `drm_exec_ticket(&exec)`. The same bug appears on both call sites at lines 976 and 985 of the diff. This will cause a type mismatch compile error.

The `amdgpu_cs.c` changes use `drm_exec_ticket(&p->exec)` which is correct (taking address of a struct member).

The `xe_validation.c` changes use `drm_exec_ticket(exec)` where `exec` is already a `struct drm_exec *` parameter — correct.

The accessor itself is fine:
```c
static inline struct ww_acquire_ctx *drm_exec_ticket(struct drm_exec *exec)
{
	return &exec->ticket;
}
```

**Summary for patch 5:** Fix the two `drm_exec_ticket(exec)` calls in `amdgpu_amdkfd_gpuvm.c` to `drm_exec_ticket(&exec)`.

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