grab_fd and grab_file: add a size arg, use everywhere.
[ccan] / ccan / list /
drwxr-xr-x   ..
-rw-r--r-- 1294 _info.c
-rw-r--r-- 634 list.c
-rw-r--r-- 6634 list.h
drwxr-xr-x - test