extern void
_mesa_unref_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj);
-extern int
-_mesa_validate_sync(struct gl_context *ctx, struct gl_sync_object *syncObj);
+extern bool
+_mesa_validate_sync(struct gl_context *ctx,
+ const struct gl_sync_object *syncObj);
extern GLboolean GLAPIENTRY
_mesa_IsSync(GLsync sync);