fix: free live_jobs and null-sentinel on realloc failure in sched_end_session

src/scheduler/src/scheduler.c

@@ -808,6 +808,8 @@ void sched_end_session(xce_scheduler_t* sched)
                     xce_sched_job_t** tmp    = realloc(live_jobs,
                                                        newcap * sizeof(*live_jobs));
                     if (tmp == NULL) {
+                        free(live_jobs);
+                        live_jobs = NULL;
                         break;
                     }
                     live_jobs = tmp;