[Merge] lp:~3v1n0/compiz/static-compregion-memory-curruption-fix into lp:compiz

[Marco Trevisan (Treviño)]

Marco Trevisan (Treviño) has proposed merging lp:~3v1n0/compiz/static-compregion-memory-curruption-fix into lp:compiz.

Commit message:
Region: nullify the priv XRegion after destroying it

Otherwise we might get a double-free since there are instances
of CompRegion wich are static and externally available
(infiniteRegion and emptyRegion) and they seem to be destroyed
in some cases when the resources are released on destruction.

All this is causing a memory corruption on exit (like LP: #1749957).

Requested reviews:
  Compiz Maintainers (compiz-team)
Related bugs:
  Bug #1750619 in compiz (Ubuntu): "Static CompRegion destruction causes memory corruption at compiz exit"
  https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1750619

For more details, see:
https://code.launchpad.net/~3v1n0/compiz/static-compregion-memory-curruption-fix/+merge/338342
-- 
Your team Compiz Maintainers is requested to review the proposed merge of lp:~3v1n0/compiz/static-compregion-memory-curruption-fix into lp:compiz.
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