Slaves that are behind the master no longer cause an error to be logged

When a slave transitions from catchup mode to up-to-date mode, an error
message is logged because the slave is at an unexpected position. This
error message should not be logged because it is a possible and an expected
situation.

server/modules/routing/binlog/blr_master.c

@@ -1953,14 +1953,6 @@ blr_distribute_binlog_record(ROUTER_INSTANCE *router, REP_HEADER *hdr, uint8_t *
                               slave->binlogfile, slave->binlog_pos,
                               hdr->next_pos - hdr->event_size);
                 }
-                else
-                {
-                    MXS_ERROR("Slave %s:%d server ID %d is at position %u when "
-                              "it should be at %u. Binlog file is '%s'.", slave->dcb->remote,
-                              ntohs((slave->dcb->ipv4).sin_port), slave->serverid,
-                              slave->binlog_pos, hdr->next_pos - hdr->event_size,
-                              slave->binlogfile);
-                }
             }
             else if (rotate)
             {