Fix for root user's max node count.

src/slurmctld/node_scheduler.c

@@ -874,7 +874,9 @@ extern int select_nodes(struct job_record *job_ptr, bool test_only)
 		max_nodes = MIN(job_ptr->details->max_nodes, 
 				part_ptr->max_nodes);
 	max_nodes = MIN(max_nodes, 500000);	/* prevent overflows */
-	if (job_ptr->details->max_nodes)
+	if (super_user)
+		req_nodes = MAX(job_ptr->details->max_nodes, min_nodes);
+	else if (job_ptr->details->max_nodes)
 		req_nodes = max_nodes;
 	else
 		req_nodes = min_nodes;