* return 1. Otherwise, simply return 0.
*/
static int
-check_for_mailing_list (ADDRESS * adr, char *pfx, char *buf, int buflen)
+check_for_mailing_list (ADDRESS * adr, const char *pfx, char *buf, int buflen)
{
for (; adr; adr = adr->next) {
if (mutt_is_subscribed_list (adr)) {