drm/nv50: allow gpuobjs that aren't mapped into aperture

Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv40_graph.c b/drivers/gpu/drm/nouveau/nv40_graph.c
index 912940e..7ee1b91 100644
--- a/drivers/gpu/drm/nouveau/nv40_graph.c
+++ b/drivers/gpu/drm/nouveau/nv40_graph.c
@@ -72,7 +72,7 @@
 	ctx.data = chan->ramin_grctx;
 	nv40_grctx_init(&ctx);
 
-	nv_wo32(chan->ramin_grctx, 0, chan->ramin_grctx->im_pramin->start);
+	nv_wo32(chan->ramin_grctx, 0, chan->ramin_grctx->pinst);
 	return 0;
 }