[PATCH 0/5] xfs: sparse warning fixes

[Dave Chinner <david@fromorbit.com>]

In chasing down a recent regression, I realised I wasn't running
sparse regularly on my "fs/xfs-only" kernel builds, and so I missed
a warning that would have prevented a bug from slipping through.

I've modified my build scripts to always run sparse when I do these
delta builds as I develop code, and I found a few other warnings
that needed to be addressed. No bugs were uncovered - they are
simply modifications and/or annotations to the code to address the
warnings and make them go away.

There remains a couple of sparse warnings in the transaction
reservation calculations - sparse throws "too many tokens" warnings
from the max(t4, max3(t1, t2, t3)) calculations. These are sparse
code parser issues, not a code problem, so I have ignored them for
now.