Fixed compile with DEBUG=1

AlexeyAB

2018-04-12 d3bdf7cfdfd695f3e4aadac92e6721c340047dd4

 src/yolo_v2_class.cpp

@@ -69,6 +69,7 @@
   }
   set_batch_network(&net, 1);
   net.gpu_index = cur_gpu_id;
   fuse_conv_batchnorm(net);

   layer l = net.layers[net.n - 1];
   int j;