[Patch, Fortran] PR56138 - fix deferred-length character funcs w/o result variable

[Tobias Burnus]

For allocatable string lengths (deferred length strings), the current 
code generates a local integer variable to which the the length is assigned.

For some reason, that doesn't work for some functions which do not use a 
result variable - leading to failures as the pass-by-reference variable 
is not dereferenced. That's fixed by the attached patch. I have to admit 
that I do not understand why it works without the patch for the examples 
in gfortran.dg/allocatable_function_5.f90, where - for some tests - also 
no result variable is used.

Build and regtested on x86-64-gnu-linux.
OK for the trunk?

Tobias
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