Add ISC_{LIST,LINK}_INITIALIZER for designated initializers
Since we are using designated initializers, we were missing initializers for ISC_LIST and ISC_LINK, add them, so you can do
*foo = (foo_t){ .list = ISC_LIST_INITIALIZER };
Instead of:
*foo = (foo_t){ 0 };
ISC_LIST_INIT(foo->list);