Index: generic/nsf.c
===================================================================
diff -u -re89a635d134e85db66c3e7059ec81817b6b36ea5 -rb6e483e0205aa1f1d618d5d536b6f7b8ed75272d
--- generic/nsf.c	(.../nsf.c)	(revision e89a635d134e85db66c3e7059ec81817b6b36ea5)
+++ generic/nsf.c	(.../nsf.c)	(revision b6e483e0205aa1f1d618d5d536b6f7b8ed75272d)
@@ -2513,7 +2513,9 @@
 
   clPtr = *firstPtrPtr;
   if (clPtr != NULL) {
-    for (; (clPtr->nextPtr != NULL) && (clPtr->cl != class); clPtr = clPtr->nextPtr);
+    while ((clPtr->nextPtr != NULL) && (clPtr->cl != class)) {
+      clPtr = clPtr->nextPtr;
+    }
     nextPtr = &clPtr->nextPtr;
   } else {
     nextPtr = firstPtrPtr;
@@ -21844,7 +21846,7 @@
  *    None.
  *
  * Side effects:
- *    Makes a class structure useable.
+ *    Makes a class structure usable.
  *
  *----------------------------------------------------------------------
  */