Fixed memory leaks. And fixes for Web-camera and IP-camera.

AlexeyAB

2018-05-04 89354d0a0ce6fbb22ff262658045cdb8796ff6fd

 src/network.c

@@ -767,6 +767,11 @@
      free_layer(net.layers[i]);
   }
   free(net.layers);

   free(net.scales);
   free(net.steps);
   free(net.seen);

#ifdef GPU
   if (gpu_index >= 0) cuda_free(net.workspace);
   else free(net.workspace);