[RFC] btrfs-progs: fix sparse checking and warnings

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Hi gang,

I was a little surprised to see that patch go by recently 
which fixed an endian bug.  I went to see how sparse
checking looked and it was.. broken.  I got it going
again in my Fedora environment.

Most of the patches are just cleanups, but there *were*
three real bugs lurking in all that sparse warning spam.
So I maintain that it's worth our time to keep it going
and fix warnings so that we have a chance of finding these
real bugs before users do.

I've only just built this and I haven't checked that it
doesn't break the build during bisection.  I wanted to
let people see it before getting too lost fiddling with it.
Dave, I'm happy to rework this as needed to get it integrated.

FWIW, it's worth running a locally built sparse from its
current git tree to avoid unknown attribute warnings.

-z

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