bug#7194: 24.0.50; Hard crash when starting many subprocesses in quick succession

[Eli Zaretskii]

> From: Steve Purcell <steve@sanityinc.com>
> Date: Tue, 12 Oct 2010 14:32:22 +0100
> Cc: 7194@debbugs.gnu.org
> 
> I recompiled with -g, repeated the crash, and found the line in question =
> -- process.c:1767
> 
>   return unbind_to (count, proc);

So this is probably here:

    static Lisp_Object
    start_process_unwind (Lisp_Object proc)
    {
      if (!PROCESSP (proc))
        abort ();