[PATCH] Fortran: fix variable definition context checks for SELECT TYPE [PR123253]

[Harald Anlauf]

Dear All,

my fix for pr71565 introduced a regression for variable definition
context checks when the selector was not a dummy variable.
The reason was that I attempted to prevent a false-negative
for one of the tests in the testcase in a too naive way while
not fully walking through an association list.  The attached
patch remedies that.

Regtested on x86_64-pc-linux-gnu.  OK for mainline?

Thanks,
Harald

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