#324 and #325 are false positives.  The result variable is initialized in the preceding lines:

    if (len_a == length) {
        left = *((volatile const unsigned char**)&a);
        result = 0;
    }
    if (len_a != length) {
        left = b;
        result = 1;
    }

While the code is correct, the second test should be changed to "else".