BUILD: pools: silence build warnings with DEBUG_MEMORY_POOLS and DEBUG_UAF

BUILD: pools: silence build warnings with DEBUG_MEMORY_POOLS and DEBUG_UAF

With these debug options we still get these warnings:

include/common/memory.h:501:23: warning: null pointer dereference [-Wnull-dereference]
    *(volatile int *)0 = 0;
    ~~~~~~~~~~~~~~~~~~~^~~
include/common/memory.h:460:22: warning: null pointer dereference [-Wnull-dereference]
   *(volatile int *)0 = 0;
   ~~~~~~~~~~~~~~~~~~~^~~

These are purposely there to crash the process at specific locations.
But the annoying warnings do not help with debugging and they are not
even reliable as the compiler may decide to optimize them away. Let's
pass the pointer through DISGUISE() to avoid this.