[Patch, Fortran] PR37420 - Fix -Wunused-variable.

[Tobias Burnus]

With the support for warning about unset result variables, printing a
warning about other unused variables got disabled. The solution is to
move sym->mark down.

sym->mask = sym->result->mark is unneeded. If the function name = result
name then  sym->result is a pointer to sym and if not, then setting
sym->mask is not needed.

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

Tobias
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