qapi: Fix to reject union command and event arguments
A command's or event's 'data' must be a struct type, given either as a dictionary, or as struct type name. Commit dd883c6f tightened the checking there, but not enough: we still accept 'union'. Fix to reject it. We may want to support union types there, but we'll have to extend qapi-commands.py and qapi-events.py for it. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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