map_deinit crash after map_init without add any values

[GF-Huang]

map_init(&m);
map_deinit(&m);  // crash

[catlause]

map_init will set m->nbuckets to 0, how could you step into the while loop without any map_set_ operations?

#define map_init(m)\
  memset(m, 0, sizeof(*(m)))