hack: fixes leack detected by a autodata

valgrind detected the following leack

....

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

lightningd/log.c

@@ -540,12 +540,14 @@ static void maybe_print(struct logger *log, const struct log_entry *l)
 			     log->log_book->log_files);
 }
 
+#ifndef NO_NOTIFICATION
 static void maybe_notify_log(struct logger *log,
 			     const struct log_entry *l)
 {
 	if (l->level >= log->print_level)
 		notify_log(log->log_book->ld, l);
 }
+#endif
 
 void logv(struct logger *log, enum log_level level,
 	  const struct node_id *node_id,
@@ -568,8 +570,9 @@ void logv(struct logger *log, enum log_level level,
 			l->log[i] = '?';
 
 	maybe_print(log, l);
+#ifndef NO_NOTIFICATION
 	maybe_notify_log(log, l);
-
+#endif
 	add_entry(log, &l);
 
 	if (call_notifier)