drm/amdgpu/jpeg1.0: fix idle work handler

On VCN 1.0, VCN and JPEG use the same worker thread so cancel
the vcn worker rather than jpeg. On VCN 2.0 and newer
there are separate workers for each.

Fixes: 93df74873703 ("drm/amdgpu/jpeg: cancel the jpeg worker")
Tested-by: George Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/jpeg_v1_0.c

···
 static void jpeg_v1_0_ring_begin_use(struct amdgpu_ring *ring)
 {
 	struct	amdgpu_device *adev = ring->adev;
-	bool	set_clocks = !cancel_delayed_work_sync(&adev->jpeg.idle_work);
+	bool	set_clocks = !cancel_delayed_work_sync(&adev->vcn.idle_work);
 	int		cnt = 0;
 
 	mutex_lock(&adev->vcn.vcn1_jpeg1_workaround);