/* All packets sent, or to be dealt with by callback below */
if (unlikely(sent != to_send))
- buffer->error_callback(&buffer->pkts[sent], to_send - sent,
- buffer->error_userdata);
+ buffer->error_callback(&buffer->pkts[sent],
+ (uint16_t)(to_send - sent),
+ buffer->error_userdata);
return sent;
}