alloc: fix missing header in compilation of example.

diff --git a/ccan/alloc/_info b/ccan/alloc/_info
index 70c65b7ea50ca935052bbd72535094defa00cfb6..6b0fef928a67f8066c42a06c812b5beda14535dd 100644 (file)
--- a/ccan/alloc/_info
+++ b/ccan/alloc/_info
@@ -23,6 +23,7 @@
  *     #include <sys/stat.h>
  *     #include <fcntl.h>
  *     #include <string.h>
+ *     #include <stdlib.h>
  *     #include <ccan/alloc/alloc.h>
  *
  *     static void usage(const char *name)