Index: generic/nsfStubLib.c
===================================================================
diff -u -rcbcfec72376d549a806859c873195cc0ebc9c9ea -r24571ae44c492c681d3efd2f2d2f5169ad7d6d57
--- generic/nsfStubLib.c	(.../nsfStubLib.c)	(revision cbcfec72376d549a806859c873195cc0ebc9c9ea)
+++ generic/nsfStubLib.c	(.../nsfStubLib.c)	(revision 24571ae44c492c681d3efd2f2d2f5169ad7d6d57)
@@ -114,14 +114,14 @@
         return NULL;
     } else {
       CONST86 NsfStubs * const stubsPtr = clientData;
-      CONST86 NsfIntStubs * const intStubsPtr = stubsPtr->hooks ?
+      CONST86 NsfIntStubs * const intStubsPtr = (stubsPtr->hooks != NULL) ?
         stubsPtr->hooks->nsfIntStubs : NULL;
 
       if (actualVersion == NULL) {
         return NULL;
       }
 
-      if (!intStubsPtr) {
+      if (intStubsPtr == NULL) {
         static char *errMsg = "missing stubInt table pointer";
 
         Tcl_ResetResult(interp);