[C++ PATCH] Fix up joust diagnostics (PR c++/89622)

[Jason Merrill]

On 3/7/19 2:25 PM, Jakub Jelinek wrote:
> Hi!
> 
> If no diagnostics is emitted by this pedwarn, whether because of
> -Wno-system-headers and location from system headers, or because of -w
> etc., we still emit the follow-up messages as if the pedwarn emitted
> something.
> 
> The following patch makes it conditional on pedwarn returning true (i.e.
> that something has been actually printed).
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
> 
> 2019-03-07  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR c++/89622
> 	* call.c (joust): Call print_z_candidate only if pedwarn returned
> 	true.

OK.

Jason