[Bug c/65244] Bogus -Wmaybe-uninitialized warning with posix_memalign() and -Og

[howarth at bromo dot med.uc.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65244

--- Comment #12 from howarth at bromo dot med.uc.edu ---
The issue also exists in current gcc-4_9-branch but applying r217317 doesn't
eliminate it there.