Fix potential flow control leak

src/core/ext/transport/chttp2/transport/parsing.c

@@ -398,6 +398,12 @@ static grpc_error *update_incoming_window(grpc_exec_ctx *exec_ctx,
     GRPC_CHTTP2_FLOW_DEBIT_STREAM("parse", t, s, incoming_window_delta,
                                   incoming_frame_size);
     s->received_bytes += incoming_frame_size;
+  } else {
+    GRPC_CHTTP2_FLOW_CREDIT_TRANSPORT("parse", t, announce_incoming_window,
+                                      incoming_frame_size);
+    GRPC_CHTTP2_FLOW_CREDIT_TRANSPORT("parse", t, incoming_window,
+                                      incoming_frame_size);
+    grpc_chttp2_initiate_write(exec_ctx, t, false, "destroy_stream");
   }
 
   return GRPC_ERROR_NONE;