fix type mismatch

[Nathan Sidwell]

In renaming the ms1 port, I had a problem rebuilding the autogenerated source 
files.  string-append and string-length complained about being given a symbol. 
I'm using guile 1.6.7.  This patch fixes the three places it was necessary to 
stringize a 'mode'.

ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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