Make sure max in fmtstr() doesn't overflow into negativity

    padlen = min - strln;

    if (min < 0 || padlen < 0)

        padlen = 0;

    if (max >= 0)

        max += padlen;      /* The maximum output including padding */

    if (max >= 0) {

        /*

         * Calculate the maximum output including padding.

         * Make sure max doesn't overflow into negativity

         */

        if (max < INT_MAX - padlen)

            max += padlen;

        else

            max = INT_MAX;

    }

    if (flags & DP_F_MINUS)

        padlen = -padlen;