[BUG]builtin echo error doing arguments parsing

[wumingxwk@xxxxxxxxx]

if there is only a '-' as argument，builtin echo won't print it

just like that:

localhost# echo -

localhost# /bin/echo -
-
localhost# bash -c 'echo -'
-
localhost# tcsh -c 'echo -'
-

so I think that's a bug

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