Re: [Gpsbabel-code] (mis)use of gpsbabel code

[Robert L. <rob...@us...>]

> sure.  i had to null out the value of mkshort_handle after calls
> to mkshort_del_handle() in both gpx_wr_deinit() and in mps_write().

I just applied a bulky but largely uninteresting change to add stronger
typing to the .*short.* family and to make del_handle more thoroughly
destroy the handle so that use-after-free will be more readily detected.

> the pointer in both cases. of course, it's entirely possible that your
> code paths are enough different than mine that you wouldn't see this
> problem.

We try to not reuse things after we free them.  Still, this was an
interesting loophole to tighten.

RJL