[GOLD] warning fixes

[Ian Lance Taylor]

On Wed, Mar 20, 2013 at 4:55 PM, Alan Modra <amodra@gmail.com> wrote:
>
>         * dwp.cc (Dwp_output_file::add_contribution): Avoid signed/unsigned
>         comparison warning.
>         * layout.cc (Layout::create_dynamic_symtab): Avoid "may be used
>         uninitialized" warning.

This is OK.

Thanks.

Ian