[Patch, Fortran] PR fortran/45117: Fix error message

[Daniel Kraft]

Hi all,

this small patch fixes PR 45117.  The problem (obviously) was that the 
error reporting assumed the expression to be of type variable (which is 
also clear from the message text), and for non-variable expressions I 
introduced a new alternative.

Ok for trunk if no regressions on GNU/Linux-x86-32?

Daniel

-- 
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Done:  Arc-Bar-Cav-Ran-Rog-Sam-Tou-Val-Wiz
To go: Hea-Kni-Mon-Pri
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