Fix range check in src/idlist.c

src/idlist.c

@@ -101,7 +101,7 @@ gboolean idlist_is_used(idlist *l, gint id) {
 	GArray *a = l->bitvector;
 	guint ndx = id / UL_BITS, bndx = id % UL_BITS;
 	gulong bmask = 1 << bndx;
-	if (id < 0 || ndx > a->len) return FALSE;
+	if (id < 0 || ndx >= a->len) return FALSE;
 
 	return (0 != (g_array_index(a, gulong, ndx) & (bmask)));
 }