drm/amdgpu/vce3: don't forget to tear down some rings

We can use .num_rings for that.

Fixes: 6f0359ff7307 ("vce3: add support for third vce ring")
Cc: Alex Deucher <[e-mail]>
Signed-off-by: Grazvydas Ignotas <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
  */
 int amdgpu_vce_sw_fini(struct amdgpu_device *adev)
 {
+	unsigned i;
+
 	if (adev->vce.vcpu_bo == NULL)
 		return 0;
 
···
 
 	amdgpu_bo_unref(&adev->vce.vcpu_bo);
 
-	amdgpu_ring_fini(&adev->vce.ring[0]);
-	amdgpu_ring_fini(&adev->vce.ring[1]);
+	for (i = 0; i < adev->vce.num_rings; i++)
+		amdgpu_ring_fini(&adev->vce.ring[i]);
 
 	release_firmware(adev->vce.fw);
 	mutex_destroy(&adev->vce.idle_mutex);