drm/nve0/graph: bump hub2gpc buffer size

Reported-by: Christoph Bumiller <e0425955@student.tuwien.ac.at>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nve0_graph.c b/drivers/gpu/drm/nouveau/nve0_graph.c
index 1ff1d4b..9cc3cf2 100644
--- a/drivers/gpu/drm/nouveau/nve0_graph.c
+++ b/drivers/gpu/drm/nouveau/nve0_graph.c
@@ -136,7 +136,7 @@
 	int gpc;
 	int ret;
 
-	ret = nouveau_gpuobj_new(dev, chan, 0x2000, 256, NVOBJ_FLAG_VM,
+	ret = nouveau_gpuobj_new(dev, chan, 0x3000, 256, NVOBJ_FLAG_VM,
 				 &grch->unk408004);
 	if (ret)
 		return ret;