[PATCH 21/25] Remove unused local variables

Fixes warnings like : unused local variable 'name' or 'name' initialized but never used

The 'a' variable in OSD_MAllocHook.cxx was introduced only to
enable inserting a breakpoint -> compiled in DEBUG mode only.

Contributed by: QbProg, Thomas Paviot, Denis Barbier
Depends on: 01-remove-__try-__finally.patch, 07-format-type-mismatch.patch