[Tux3] Add more buffer debug code

[OGAWA Hirofumi]

Hi,

This is mainly for debugging buffer state, and cleanup for it.  I think
we will play with buffer soon, to get bugs more early, I hope this is
useful for it.

	static-http://userweb.kernel.org/~hirofumi/tux3/

Please review.
-- 
OGAWA Hirofumi <hirofumi at mail.parknet.co.jp>

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