RFA: fix to thinko in make-relative-prefix.c:make_relative_prefix_1

[Ian Lance Taylor]

"Douglas Evans" <dje@google.com> writes:

> Simple thinko.  Return of NULL from strdup isn't checked.
> 
> Ok to check in?
> 
> 2007-11-13  Doug Evans  <dje@google.com>
> 
>         * make-relative-prefix.c (make_relative_prefix_1): Handle NULL
>         return from strdup.

This is OK.

However, at this point it should wait until gcc 4.3 has branched.
Sorry for the rather slow review.

Thanks.

Ian