unreachable code in g2_addfield.c

[edwardhartnett]

In g2_addfield.c we have this code:

    else
    {
        printf("g2_addfield: Data Representation Template 5.%ld not yet implemented.\n", idrsnum);
        ierr = -7;
        return ierr;
    }

But this code can never be reached, because if the drsnum is wrong, we already discovered that and returned a -5.

[edwardhartnett]

OK, this can't be reached but that's OK in this case. This is the equivalent of a default in a case statement that cannot be reached.