[ccan] rbtree.c build failure with gcc 4.5.1

[Scott Olson]

Hi,

I am getting the following warning/error build failure on fedora 14
with gcc-4.5.1

cc1: warnings being treated as errors
ccan/rbtree/rbtree.c: In function ‘tree_destructor_traverse_node’:
ccan/rbtree/rbtree.c:24:2: error: taking address of expression of type ‘void’
ccan/rbtree/rbtree.c:24:2: error: taking address of expression of type ‘void’
ccan/rbtree/rbtree.c:24:2: error: taking address of expression of type ‘void’
ccan/rbtree/rbtree.c:24:2: error: taking address of expression of type ‘void’
ccan/rbtree/rbtree.c:24:2: error: taking address of expression of type ‘void’
ccan/rbtree/rbtree.c:24:2: error: taking address of expression of type ‘void’
ccan/rbtree/rbtree.c:24:2: error: taking address of expression of type ‘void’
make: *** [ccan/rbtree/rbtree.o] Error 1

This doesn't happen on fedora 12 with gcc-4.4.4. I'm not much of a C
programmer so I have no idea how to fix it. I only wanted to mess with
the dns_lookup example program in antithread

-scott