[patch] Avoid false valgrind warnings on linux_ptrace_test_ret_to_nx

[Philippe Waroquiers]

On Tue, 2013-02-19 at 19:42 +0100, Jan Kratochvil wrote:

> +#ifdef HAVE_RUNNING_ON_VALGRIND
> +  if (HAVE_RUNNING_ON_VALGRIND)
Isn't it rather 
     if (RUNNING_ON_VALGRIND)
which is needed ?
> +    return;
> +#endif
> +