Added a PAGE_DEFAULT_SIZE so max can be set to 0

lib/heap.c

@@ -16,6 +16,9 @@
 
 page_t *page_create(size_t max, page_t *next)
 {
+  if (max == 0)
+    max = PAGE_DEFAULT_SIZE;
+
   page_t *page    = calloc(1, sizeof(*page) + max);
   page->available = max;
   page->next      = next;

lib/heap.h

@@ -18,6 +18,8 @@
 #include <stdbool.h>
 #include <stdlib.h>
 
+#define PAGE_DEFAULT_SIZE 256
+
 typedef struct Page
 {
   struct Page *next;