Don't leak res in network_init(..)

Call freeaddrinfo on it after it's been used

MFC after: 1 week
Reported by: Coverity
CID: 1225050
Sponsored by: EMC / Isilon Storage Division

usr.sbin/rpcbind/util.c

@@ -396,6 +396,7 @@ network_init(void)
 	freeifaddrs(ifp);
 #endif
 
+	freeaddrinfo(res);
 	/* close(s); */
 }