drm/amdgpu: fix JPEG instance checking when ctx init

Use proper structure.

Fixes: 0388aee766376ed ("drm/amdgpu: use the JPEG structure for general driver support")
Signed-off-by: Leo Liu <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Reviewed-by: James Zhu <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 			break;
 		case AMDGPU_HW_IP_VCN_JPEG:
 			for (j = 0; j < adev->jpeg.num_jpeg_inst; ++j) {
-				if (adev->vcn.harvest_config & (1 << j))
+				if (adev->jpeg.harvest_config & (1 << j))
 					continue;
 				rings[num_rings++] = &adev->jpeg.inst[j].ring_dec;
 			}