drm/nouveau/bar/nv50: check bar1 vmm return value

Check bar1's new vmm creation return value for errors.
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/subdev/bar/nv50.c

@@ -168,6 +168,8 @@ nv50_bar_oneinit(struct nvkm_bar *base)
 
 	ret = nvkm_vmm_new(device, start, limit-- - start, NULL, 0,
 			   &bar1_lock, "bar1", &bar->bar1_vmm);
+	if (ret)
+		return ret;
 
 	atomic_inc(&bar->bar1_vmm->engref[NVKM_SUBDEV_BAR]);
 	bar->bar1_vmm->debug = bar->base.subdev.debug;