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gvariant: Limit recursion in g_variant_parse()

Philip Withnall requested to merge pwithnall/glib:ossfuzz-10286-variant-parser-recursion into master

The token parsing done by g_variant_parse() uses recursive function calls, so at some point it will hit the stack limit. As with previous changes to GVariantType parsing (commit 7c4e6e9f), limit the level of nesting of containers parsed by g_variant_parse() to something reasonable. We guarantee 64 levels of nesting, which should be enough for anyone, and is the same as what we guarantee for types.

oss-fuzz#10286

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

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