fix fs-integrity for non-PI metadata v3

Christoph Hellwig <[email protected]>
Newsgroups org.kernel.vger.linux-xfs,org.kernel.vger.linux-block,org.kernel.vger.linux-fsdevel
Message-ID <[email protected]> 
Hi all,

this series fixes incorrect calls into the PI generation helpers
when using fs-integrity on devics with non-PI metadata, which can
cause kernel crashes.

Changes since v2:
 - split the iomap patch into a separate series.

Changes since v1:
 - fix two more null pointer dereferences
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