[Tux3] kernel/ileaf.c fixes and cleanup

[OGAWA Hirofumi]

Hi,

I've found several bugs in kernel/ileaf.c. Even if all inodes on ileaf
was removed, we don't remove ileaf itself, at least for now.  So, we
have to handle empty ileaf, but in that case, some places is not
handling it correctly.

And several cleanups.

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

I'm not reviewing those by myself, it is for the review. So, please
don't pull it yet.  However, with this patchset, it passed the fsstress
test for several hours.

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

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