Bugfix domain parallelization

Nicolas Tancogne-Dejeanrequested to merge
make_valgrind_happy into hotfix-16.2

Description

Valgrind was complaining about conditional jumps depending on unitialized variables.

A more severe bug is found for the routine submesh_broadcast that probably impacted periodic systems with domain decomposition.

News snippet

Minor fix.

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.
Edited by Nicolas Tancogne-Dejean

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