We've defined "don't use kist" as a negative interval, so don't check for -1

Of course == -1 doesn't make sense when KISTSchedRunInterval is a unsigned as it currently is (legacy/trac#23538 (moved))

@@ -288,9 +288,9 @@ select_scheduler(void)
     case SCHEDULER_KIST:
       if (!scheduler_can_use_kist()) {
 #ifdef HAVE_KIST_SUPPORT
-        if (get_options()->KISTSchedRunInterval == -1) {
+        if (get_options()->KISTSchedRunInterval < 0) {
           log_info(LD_SCHED, "Scheduler type KIST can not be used. It is "
-                             "disabled because KISTSchedRunInterval=-1");
+                             "disabled because KISTSchedRunInterval is < 0");
         } else {
           log_notice(LD_SCHED, "Scheduler type KIST has been disabled by "
                                "the consensus.");