Fix a bug in free_lists (#342)

The array index was incorrectly assigned to i instead of j, leading to
incorrect logic.

Co-authored-by: Chun-Hung Tseng <[email protected]>

Author: henrybear327

src/cache.c

@@ -153,7 +153,7 @@ cache_t *cache_create(int size_bits)
     free(cache->map);
 free_lists:
     for (int j = 0; j < i; j++)
-        free(cache->lists[i]);
+        free(cache->lists[j]);
 
     free(cache);
     return NULL;