Prevent abort when using node features on non-knl

Bug 5544

NEWS

@@ -38,6 +38,7 @@ documents those changes that are of interest to users and administrators.
  -- Fix sacctmgr setting GrpJobs limit when setting GrpJobsAccrue limit.
  -- Change the defaults to MemLimitEnforce=no and NoOverMemoryKill
     (See RELEASE_NOTES).
+ -- Prevent abort when using Cray node features plugin on non-knl.
 * Changes in Slurm 18.08.0
 ==========================

src/plugins/node_features/knl_cray/node_features_knl_cray.c

@@ -1587,7 +1587,7 @@ static void _update_all_node_features(
 	 */
 	for (i = 0, node_ptr = node_record_table_ptr; i < node_record_count;
 	     i++, node_ptr++) {
-		if (bit_test(knl_node_bitmap, i)) {
+		if (knl_node_bitmap && bit_test(knl_node_bitmap, i)) {
 			if (validate_mode)
 				_validate_node_features(node_ptr);
 			continue;