update ARENA_ALLOC macro args

src/asset.cpp

@@ -75,7 +75,7 @@ arenaCopyCStr(memory_arena* arena, const char* input, u32 max_len)
 {
 	u32 name_len = std::strlen(input) + 1;
 	assert(name_len < max_len);
-	char* out = ARENA_ALLOC(arena, name_len, char);
+	char* out = ARENA_ALLOC(arena, char, name_len);
 	std::strncpy(out, input, name_len);
 	return out;
 }

src/asset.h

@@ -33,7 +33,8 @@ void arenaFree(memory_arena*& arena);
 
 uint arenaGetFreeSize(memory_arena* arena);
 
-#define ARENA_ALLOC(arena, len, type) (type*) arenaAllocateBlock(arena, len)
+#define ARENA_ALLOC(arena, type, count) \
+	(type*) arenaAllocateBlock(arena, sizeof(type) * count)
 void* arenaAllocateBlock(memory_arena* arena, size_t block_size);
 
 #define MAX_NAME_LENGTH 256