ARI fix: remove tailing new line warning in nios2-tdep.c

[Joel Brobecker]

> 2013-05-07  Pierre Muller  <muller@sourceware.org>
> 
>         * nios2-tdep.c (nios2_dwarf_reg_to_regnum): ARI fix: remove
>         trailing new line from warning message.

Of course. I would consider these fixes as obvious.

Thanks for the fix, Pierre.
-- 
Joel