session_server_server: changes due to PR review

Author: SESA747457

src/session_server.c

@@ -4030,9 +4030,7 @@ nc_server_notif_cert_exp_thread(void *arg)
     if (targ->clb_free_data) {
         targ->clb_free_data(targ->clb_data);
     }
-    if (exp_dates) {
-        nc_server_notif_cert_exp_dates_destroy(exp_dates, exp_date_count);
-    }
+    nc_server_notif_cert_exp_dates_destroy(exp_dates, exp_date_count);
     free(targ);
     return NULL;
 }