[Patch, Fortran] PR32483 - Checking for zero-width in edit decriptors for READ

[Tobias Burnus]

:ADDPATCH fortran:

Add a zero-width check for w in Fw.p (F) and Iw[.p] (IBOZ) in READ
statements.

Build & regression tested on x86_64-unknown-linux-gnu with no new failures..
Ok for the trunk?

Tobias
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