typesafe_cb: fix up (and test!) cast_if_any.
[ccan] / tools / ccanlint /
drwxr-xr-x   ..
-rw-r--r-- 1225 Makefile
-rw-r--r-- 9479 ccanlint.c
-rw-r--r-- 5239 ccanlint.h
drwxr-xr-x - compulsory_tests
-rw-r--r-- 12711 file_analysis.c
drwxr-xr-x - test
drwxr-xr-x - tests