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gscanner: Avoid undefined behaviour copying between union members

Philip Withnall requested to merge pwithnall/glib:scanner-undefined-behaviour into master

It’s technically undefined behaviour in C to copy between two potentially-overlapping regions of memory (just like it is when calling memcpy()). This can easily happen with union members; and the ones in GScanner in particular.

Fix that by copying through an intermediate variable.

Coverity CID: #1427317, 1427340

Signed-off-by: Philip Withnall pwithnall@endlessos.org

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