test-qemu-opts: Simplify test_has_help_option() after bug fix
Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Message-Id: <20200415074927.19897-6-armbru@redhat.com>
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