[PATCH] Fortran: error recovery simplifying UNPACK for insufficient FIELD [PR107922]

[Harald Anlauf]

Dear all,

we did not properly handle the case of insufficient array-valued
FIELD when trying to simplify UNPACK and could run into a NULL
pointer dereference.  The fix is obvious.

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

Thanks,
Harald

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