[RFA] Fix 4K leak in open_source_file each time next/step changes of function.

[Philippe Waroquiers]

On Mon, 2018-11-05 at 13:02 -0700, Tom Tromey wrote:
> > > > > > "Philippe" == Philippe Waroquiers <philippe.waroquiers@skynet.be> writes:
> 
> Philippe> Note that I do not understand why find_and_open_source always tries to
> Philippe> re-execute the substitution rules on the provided fullname, as source.c
> Philippe> symtab_to_fullname just blindly returns a non NULL s->fullname, counting on
> Philippe> forget_cached_source_info to be called if search dir or substitution rules are
> Philippe> changed.  Similarly, psymtab_to_fullname also just returns a non NULL
> Philippe> ps-> fullname.
> 
> It would be good to investigate & maybe remove this.
> 
> Philippe> 2018-11-04  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
> 
> Philippe> 	* source.c (open_source_file): Fix leak by transferring the
> Philippe> 	current s->fullname to the unique_xmalloc_ptr fullname given
> Philippe> 	to find_and_open_source.
> 
> Thanks, this is ok.
Thanks for the review, pushed.

I have added on my list of things to do to clarify find_and_open_source
substitution rules apply/re-apply logic.

Philippe