storage/connect/tabmac.cpp:369: pointless call to strncpy ?

mariadb-10.2.9/storage/connect/tabmac.cpp:369] -> [mariadb-10.2.9/storage/connect/tabmac.cpp:371]: (performance) Buffer 'buf' is being written before its old content has been used.

      if ((p = strstr(adp->Description, " - Packet Scheduler Miniport"))) {

        strncpy(buf, adp->Description, p - adp->Description);

        i = p - adp->Description;

        strncpy(buf, adp->Description, i);

        buf[i] = 0;