pthread_mutex_trylock return value on recursion

[Konstantin Belousov]

On Wed, Jun 29, 2016 at 08:34:25AM +0200, Volker Lendecke wrote:
> On Tue, Jun 28, 2016 at 12:38:33PM -0700, Jeremy Allison wrote:
> > Something like the attached ?
> 
> Pushed, thanks!
Thank you.

> 
> Konstantin had asked for a compile-time check, but I think this is not
> really required. Am I right?

I asked either for the change as posted, or for the configure-time check.
I do not see why would both checks needed.