foreach: allow a single argument to foreach_int() and foreach_ptr().
[ccan] / ccan / foreach / test /
drwxr-xr-x   ..
-rw-r--r-- 593 run-break.c
-rw-r--r-- 2177 run-nested.c
-rw-r--r-- 421 run-single-arg.c
-rw-r--r-- 527 run.c