* null-threads.c: fix various preprocessor usages of new public

symbols to expect 0 or 1 values rather than 1 or undefined.
i.e. change #ifdef to #if, etc.

diff --git a/libguile/null-threads.c b/libguile/null-threads.c
index 05b3ca4..ab43bd8 100644 (file)
--- a/libguile/null-threads.c
+++ b/libguile/null-threads.c
@@ -104,7 +104,7 @@ scm_threads_mark_stacks (void)
 
   {
     unsigned long stack_len = scm_stack_size (scm_stack_base);
-#ifdef SCM_STACK_GROWS_UP
+#if SCM_STACK_GROWS_UP
     scm_mark_locations (scm_stack_base, stack_len);
 #else
     scm_mark_locations (scm_stack_base - stack_len, stack_len);