drm/nouveau/bios/init: return failure condition on invalid opcodes

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/subdev/bios/init.c

@@ -2210,5 +2210,5 @@ nvbios_init(struct nouveau_subdev *subdev, bool execute)
 		ret = nvbios_exec(&init);
 	}
 
-	return 0;
+	return ret;
 }