Possible bug fix for clf.m in 3.0.4-rc5

[Marco Caliari]

Dear maintainers,

this is my patch to fix the two bugs related to clf.m described here 
https://www-old.cae.wisc.edu/pipermail/octave-maintainers/2009-February/011059.html

I wrote the patch simply comparing 3.0.3 with 3.0.4-rc5, since my 
knowledge of the graphic system is quite bad.
I hope it can help at least to make a good changeset.

Best regards,

Marco
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