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When parsing string option, in order to avoid memory leak we need to carefully free it first in case of specifying same option several times. Signed-off-by: Chengguang Xu <cgxu519@icloud.com> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>