[Tux3] cleanup and tux3graph improvement

[OGAWA Hirofumi]

Hi,

Those patches are trivial cleanup, and tux3graph improvement. Well, the
output of tux3graph is not changed much, however, perhaps the
preparation to dump the data which is pointed by extents is done almost.

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

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

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