qapi: Use QNull for a more regular visit_type_null()
Make visit_type_null() take an @obj argument like its buddies. This helps keep the next commit simple. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NDaniel P. Berrange <berrange@redhat.com>
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