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gvariant-parser: Add explicit unsigned-to-signed casts

Philip Withnall requested to merge pwithnall/glib:1655-int-signedness-casts into master

Rather than prefixing unsigned numbers with unary minus operators and expecting the implicit cast to carry the correct value through, add an explicit cast to a signed type before the unary minus is applied.

In all four cases, an overflow check has already been done.

Signed-off-by: Philip Withnall withnall@endlessm.com

#1655 (closed)

Closes #1655 (closed)

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