migration: update ram_counters for multifd sync packet

Multifd sync will send MULTIFD_FLAG_SYNC flag info to destination, add
these bytes to ram_counters record.
Signed-off-by: NIvan Ren <ivanren@tencent.com>
Suggested-by: NWei Yang <richardw.yang@linux.intel.com>
Message-Id: <1564464816-21804-4-git-send-email-ivanren@tencent.com>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>

migration/ram.c

@@ -1085,6 +1085,8 @@ static void multifd_send_sync_main(RAMState *rs)
         p->flags |= MULTIFD_FLAG_SYNC;
         p->pending_job++;
         qemu_file_update_transfer(rs->f, p->packet_len);
+        ram_counters.multifd_bytes += p->packet_len;
+        ram_counters.transferred += p->packet_len;
         qemu_mutex_unlock(&p->mutex);
         qemu_sem_post(&p->sem);
     }