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Use GString to pass argument to make_cli() so that it would be easy to dynamically change test case arguments from main(). The follow up patch will use it to change RAM size options depending on target. While at it cleanup 'cli' freeing, using g_autofree annotation. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-Id: <20200219160953.13771-79-imammedo@redhat.com>