antithread: avoid arithmetic on void pointers

[ccan] / ccan / failtest / failtest.c

diff --git a/ccan/failtest/failtest.c b/ccan/failtest/failtest.c
index 334295ad158ed8a8852c5bfe7487b7db0666e303..0f2ab0c7f2cda15464d0ee7dc81b16d34e25b602 100644 (file)
--- a/ccan/failtest/failtest.c
+++ b/ccan/failtest/failtest.c
@@ -84,8 +84,9 @@ static struct failtest_call *add_history_(enum failtest_call_type type,
 #define add_history(type, file, line, elem) \
        add_history_((type), (file), (line), (elem), sizeof(*(elem)))
 
+/* We do a fake call inside a sizeof(), to check types. */
 #define set_cleanup(call, clean, type)                 \
-       (call)->cleanup = (void *)((void)sizeof(clean((type *)NULL)), (clean))
+       (call)->cleanup = (void *)((void)sizeof(clean((type *)NULL),1), (clean))
 
 static bool read_write_info(int fd)
 {