[PATCH] fixups for immutable biovecs

[Kent Overstreet]

Jens - for the "silence spurious compiler warnings", if you want to drop the
previous version of that patch and replace with this one, it appears
uninitialized_var() doesn't work on structs. And I somehow lost the btrfs
fixes Chris Mason did for bio chaining and had to redo them so hopefully he
can glance at them, but it does pass xfstests.

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