[Patch, fortran] PR21459 - strings of different length in a single character(len=*) declaration

[Paul Thomas]

:ADDPATCH fortran:

Erik,

>> It seems that PR 21459 suffers from a very similar problem.  Do
>> you think it would be hard to extend your patch to fix that one
>> as well?
>>  
>
> Yes, it does look similar. In fact, I think that Tobi had the solution 
> and that the memory leak can be fixed by ensuring that the charlen's 
> are chained to the namespace's cl_list. I have marked it in huge 
> letters at the top of today's journal entry. I'll look at it when..... 

Tobi's fix was indeed OK and the memory leak is fixed by attaching the 
gfc_charlen to the namespace's cl_list; thereby permitting 
gfc_clear_namespace () to clean it up.  The testcase is the original 
example from the PR.

Bubblestrapped and regtested on FC3/i686.  OK for mainline and 4.0?

Paul
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