utf8: don't allow NUL in decoded strings.
[ccan] / ccan / rbuf /
drwxr-xr-x   ..
lrwxrwxrwx 22 LICENSE -> ../../licenses/BSD-MIT
-rw-r--r-- 1154 _info
-rw-r--r-- 2183 rbuf.c
-rw-r--r-- 4697 rbuf.h
drwxr-xr-x - test