drm/amdgpu: fix crash in acp_hw_fini

On CZ/ST systems with AZ rather than ACP audio, we need to bail
early in hw_fini since there is nothing to do.

bug: https://bugs.freedesktop.org/show_bug.cgi?id=98276

Signed-off-by: Alex Deucher <[e-mail]>
Cc: [e-mail]

drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c

···
 {
 	int i, ret;
 	struct device *dev;
-
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	/* return early if no ACP */
+	if (!adev->acp.acp_genpd)
+		return 0;
 
 	for (i = 0; i < ACP_DEVS ; i++) {
 		dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);