Remove duplicate address family from listener

Since address already contain family, remove separate family from
listener. Use now family from address itself.

src/dnsmasq.h

@@ -572,7 +572,7 @@ struct irec {
 };
 
 struct listener {
-  int fd, tcpfd, tftpfd, family, used;
+  int fd, tcpfd, tftpfd, used;
   union mysockaddr addr;
   struct irec *iface; /* only sometimes valid for non-wildcard */
   struct listener *next;