[gforth] typo in utf-8.fs

[Marcos Cruz]

I found a little typo in the <utf-8.fs> file (in 0.7.0 and 0.7.2):

        : u8addrlen ( u8-addr u -- u )  drop

Although the code is clear, at first sight it seems the 'u'
parameter is returned back.

        : u8addrlen ( u8-addr u -- u1 )  drop

Marcos

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