[RFC PATCH] Fix segmentation fault of listing kprocess.create

[Wenji Huang]

> Hi,
> 
> I got the Segmentation fault when executing stap -L 
> kprocess.create for latest
> source. The same issue happens on FC11 32bits and RHEL5U2 
> (64bits 2.6.32 kernel),
> with elfutils 0.141-0.143. But  'probe 
> kprocess.create{print(task) print(new_pid) print($$parms)}'
> works fine on those machines.
> 
Please ignore the previous patch, the root cause is the following section
tapsets.cxx: dwarf_derived_probe::saveargs

         /* trick from visit_target_symbol_context */
         target_symbol *tsym = new target_symbol;
         token *t = new token;
         tsym->tok = t;
         tsym->base_name = "$";
         tsym->base_name += arg_name;

The empty token is created, I will fix it soon. 
Also any suggestion is welcome!

Regards,
Wenji