use mrb_bool, FALSE and TRUE more

It doesn't matter to me if one is using FALSE/TRUE instead of 1/0
but I prefer a type (alias) which emphasizes boolean vars to int.
I changed 1/0 to FALSE/TRUE anyway.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gc.c b/src/gc.c
index 63301d5cd..7e7e0d3ee 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -834,13 +834,13 @@ incremental_sweep_phase(mrb_state *mrb, size_t limit)
     RVALUE *p = page->objects;
     RVALUE *e = p + MRB_HEAP_PAGE_SIZE;
     size_t freed = 0;
-    int dead_slot = 1;
+    mrb_bool dead_slot = TRUE;
     int full = (page->freelist == NULL);
 
     if (is_minor_gc(mrb) && page->old) {
       /* skip a slot which doesn't contain any young object */
       p = e;
-      dead_slot = 0;
+      dead_slot = FALSE;
     }
     while (p<e) {
       if (is_dead(mrb, &p->as.basic)) {