Memory leak in get_keras_h5_layers

[jacobwilliams]

In get_keras_h5_layers, this code:

    call json % parse(model_config_json, model_config_string)

allocates the local model_config_json pointer, but it is not destroyed in this routine, so that's a memory leak. You should add a:

   call json % destroy (model_config_json)

At the end to free the memory. The other json_value pointers all look like they are just pointing to data inside this structure, so you don't have to worry about those.

FYI: the higher-level json_file class is a little safer (but less flexible) to use since it will destroy the pointer when it goes out of scope (it has a finalizer). What you have here is fine though (you just need the destroy call at the end).

[milancurcic]

Thanks! Mind putting a quick PR for this? I would like to add you to the list of contributors.