redis_3.0.7_sds.c_dsRemoveFreeSpace()

sds sdsRemoveFreeSpace(sds s)
{
   struct sdshdr *sh;
sh = (void*)(s-(sizeof(struct sdshdr)));
    sh = realloc(sh,sizeof(struct sdshdr)+sh->len+1);
//这一句源函数是zrealloc()函数，我替换成realloc()函数。
  //
    sh->free;
    return sh->buf;
}