Call ref/unref, bugfixes
diff --git a/grpc.def b/grpc.def
index 39f06d8..266ca59 100644
--- a/grpc.def
+++ b/grpc.def
@@ -83,7 +83,7 @@
     grpc_channel_destroy
     grpc_call_cancel
     grpc_call_cancel_with_status
-    grpc_call_destroy
+    grpc_call_unref
     grpc_server_request_call
     grpc_server_register_method
     grpc_server_request_registered_call