[patch, Fortran, committed] Free temporary variables

[Tobias Burnus]

Another obvious leakage fix: For "if( e1 == NULL || e2 == NULL)" one has 
to free the non-NULL expression (if there is one). Similarly, vector of 
type "tree *" has to be freed - we only need the elements of that vector.

Build and tested on x86-64-linux.
Committed as Rev. 190731

Tobias
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