[Patch, fortran] PR39879 - [4.3/4.4/4.5 Regression] double free or corruption abort with gfortran

[Paul Richard Thomas]

Tobias and Dominique,

Thanks for the test/review.

> The patch works as advertised without regression.
> Note that the patch in pr39879 did too.

Yes, but this was not formally correct:-)  You could change the rhs
within the assignment procedure.

Cheers

Paul