strset, strmap: invert iterator function meaning.
[ccan] / ccan / strset /
drwxr-xr-x   ..
-rw-r--r-- 1623 _info
-rw-r--r-- 7164 strset.c
-rw-r--r-- 4148 strset.h
drwxr-xr-x - test
drwxr-xr-x - tools