Fix A1 allocator to map the correct pages

src/hulk/hurl/a1.d

@@ -35,17 +35,17 @@ struct A1
 
         ulong address = Hurl.A1_BASE + allocated;
 
-        ulong mapped_limit = round_up_power_2(address, PAGE_SIZE);
+        ulong current_limit = round_up_power_2(address, PAGE_SIZE);
 
         allocated += size;
 
         ulong desired_limit = round_up_power_2(Hurl.A1_BASE + allocated, PAGE_SIZE);
 
-        while (desired_limit > mapped_limit)
+        while (desired_limit > current_limit)
         {
             void * page = Hippo.allocate_page();
-            Hurl.map(Hurl.A1_BASE + mapped_limit, page, PT_WRITABLE);
-            mapped_limit += PAGE_SIZE;
+            Hurl.map(current_limit, page, PT_WRITABLE);
+            current_limit += PAGE_SIZE;
         }
 
         return cast(void *)address;