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For QMP commands without arguments, gen_marshal() laboriously generates a qmp_marshal_FOO() that copes with null @args. Turns there's just one caller that passes null instead of an empty QDict. Adjust that caller, and simplify gen_marshal(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20200424084338.26803-15-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>