Compilation warning in simple-object-xcoff.c

[Eli Zaretskii]

> Date: Mon, 22 Jan 2018 08:27:44 +0400
> From: Joel Brobecker <brobecker@adacore.com>
> Cc: gdb-patches@sourceware.org
> 
> > > I committed the patch.
> > 
> > So now that this patch is committed to upstream libiberty, is it OK to
> > push it to GDB's copy of the library?
> 
> Yes. For libiberty, incorporating patches from upstream is considered
> an "obvious" change in the sense that it does not require prior
> approval. We should actually always keep the two in sync, but as
> we know, they easily forget, hence the occasion "resync" patches...

Thanks, pushed to master and cherry-picked to gdb-8.1-branch.