* caller becomes responsible for freeing the buffer. However, if 'id'
* identifies a "null" packet buffer (created with pktbuf_get_null()), stores
* NULL in '*bufferp' and UINT16_max in '*in_port'.
* caller becomes responsible for freeing the buffer. However, if 'id'
* identifies a "null" packet buffer (created with pktbuf_get_null()), stores
* NULL in '*bufferp' and UINT16_max in '*in_port'.