T: minor: don't abort() in textlog.c

This leads to some logs missing in some situations.
Plus it's not user-friendly.

common/utils/T/tracer/textlog.c

@@ -187,7 +187,7 @@ int main(int n, char **v)
   while (1) {
     event e;
     e = get_event(textlog_data.socket, &ebuf, database);
-    if (e.type == -1) abort();
+    if (e.type == -1) break;
     handle_event(h, e);
   }