fix(emqx_misc): ensure flatten list for safe dir
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@ -720,4 +720,4 @@ pub_props_to_packet(Properties) ->
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safe_filename(Filename) when is_binary(Filename) ->
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binary:replace(Filename, <<":">>, <<"-">>, [global]);
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safe_filename(Filename) when is_list(Filename) ->
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string:replace(Filename, ":", "-", all).
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lists:flatten(string:replace(Filename, ":", "-", all)).
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