mem: add memcheck() for valgrind.
[ccan] / ccan / mem /
drwxr-xr-x   ..
lrwxrwxrwx 18 LICENSE -> ../../licenses/CC0
-rw-r--r-- 551 _info
-rw-r--r-- 1536 mem.c
-rw-r--r-- 6781 mem.h
drwxr-xr-x - test