Do not mask errors messages.
Do not mask errors messages.

git-svn-id: 85ac67bc7c4afe135c9a2a80330376080c31cd41@3910 4b44e086-7f34-40ce-a3bd-00e031736276

BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc