[PATCH obv] Fix non stopping breakpoint on newer compilers.

[Joel Brobecker]

> The breakpoint presented in the return statement was not activated while
> compiling the test with gcc 4.9.2.  Added a dummy statement to allow the
> breakpoint again.
> 
> 2015-10-14  Walfred Tedeschi  <walfred.tedeschi@intel.com>
> 
> gdb/testsuite:
> 
> 	* i386-mpx-map.c (foo): Add dummy statement to trigger breakpoint.

Looks good to me.

-- 
Joel