Minor updates

src/arena.c

@@ -13,13 +13,8 @@ Arena *arena_alloc(const ArenaParams *params)
     Assert(params->size > ARENA_HEADER_SZ);
     Assert(params->size < (U32_Max -  ARENA_HEADER_SZ - 1));
 
-    // Note: only backend now is malloc
     void *base;
-    if (params->flags & ArenaFlag_UseMalloc){
-        base = platform_malloc(params->size);
-    }  else {
-        base = memory_allocate(params->size);
-    }
+    base = memory_allocate(params->size);
     Assert(base != NULL);
     ASAN_UNPOISON_MEMORY_REGION(base, ARENA_HEADER_SZ);
 
@@ -43,11 +38,7 @@ void arena_free(Arena *arena)
 
     while (it != NULL) {
         Arena *prev = it->prev;
-        if (it->flags & ArenaFlag_UseMalloc){
-            platform_free(it->base);
-        }  else {
-            memory_free(it->base, it->size);
-        }
+        memory_free(it->base, it->size);
         it = prev;
     }
 }
@@ -98,12 +89,7 @@ void arena_pop_to(Arena *arena, U32 abs_pos)
 
         if (current->base_pos >= abs_pos) {
             ASAN_UNPOISON_MEMORY_REGION(current->base, current->size); // needed as we use malloc
-            if (current->flags & ArenaFlag_UseMalloc){
-                platform_free(current->base);
-            }  else {
-                memory_free(current->base, current->size);
-            }
-
+            memory_free(current->base, current->size);
             arena->current = prev;
         } else {
             U32 new_pos = abs_pos - current->base_pos;