mem.c rt_smem_free函数中 启用RT_DEBUG_MEM 后，small_mem 变量未初始化！

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/**
 * @brief This function will release the previously allocated memory block by
 *        rt_mem_alloc. The released memory block is taken back to system heap.
 *
 * @param rmem the address of memory which will be released.
 */
void rt_smem_free(void *rmem)
{
    struct rt_small_mem_item *mem;
    struct rt_small_mem *small_mem;

    if (rmem == RT_NULL)
        return;

    RT_ASSERT((((rt_ubase_t)rmem) & (RT_ALIGN_SIZE - 1)) == 0);

    /* Get the corresponding struct rt_small_mem_item ... */
    mem = (struct rt_small_mem_item *)((rt_uint8_t *)rmem - SIZEOF_STRUCT_MEM);

    RT_DEBUG_LOG(RT_DEBUG_MEM,
                 ("release memory 0x%x, size: %d\n",
                  (rt_ubase_t)rmem,
                  (rt_ubase_t)(mem->next - ((rt_uint8_t *)mem - small_mem->heap_ptr))));

    /* ... which has to be in a used state ... */
    small_mem = MEM_POOL(mem);
    RT_ASSERT(small_mem != RT_NULL);
    RT_ASSERT(MEM_ISUSED(mem));
    RT_ASSERT(rt_object_get_type(&small_mem->parent.parent) == RT_Object_Class_Memory);
    RT_ASSERT(rt_object_is_systemobject(&small_mem->parent.parent));
    RT_ASSERT((rt_uint8_t *)rmem >= (rt_uint8_t *)small_mem->heap_ptr &&
              (rt_uint8_t *)rmem < (rt_uint8_t *)small_mem->heap_end);
    RT_ASSERT(MEM_POOL(&small_mem->heap_ptr[mem->next]) == small_mem);

    /* ... and is now unused. */
    mem->pool_ptr = MEM_FREED();

RT_DEBUG_LOG 时small_mem 变量未初始化，会出现 BusFault.