PATCH: libiberty/cp-demangle.c, guard against null

[msnyder@sonic.net]

> msnyder@sonic.net writes:
>
>> 2007-07-31  Michael Snyder  <msnyder@access-company.com>
>>
>> 	* cp-demangle.c (d_print_comp): Guard against null.
>
> This is OK.

Committed.
Thanks.