Fix major regression: Get backtrace in malloc properly.
Fix major regression: Get backtrace in malloc properly.

Zomg, I must have been asleep when I comitted this - sorry.

muojp/heaptrack,stormspirit/heaptrack,muojp/heaptrack,muojp/heaptrack,stormspirit/heaptrack,stormspirit/heaptrack,muojp/heaptrack,muojp/heaptrack