Limit number of integrity segments

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[My script defaulted to Jens' old address.  Sorry about the repost]

First patch moves min_not_zero() to kernel.h.  It's currently defined
several places throughout the block layer and I was about to introduce
another instance.  So let's make this generic.

Second patch works around the limitations in the zfcp hardware by
introducing a limit on the number of integrity scatterlist elements.
Christof will post a separate patch that updates the zfcp driver to take
advantage of this.

I'd prefer we if could feed everything, including the SCSI changes,
through the block tree.  I have had to change some existing interfaces
so a post-merge tree will not cut it and compatibility wrappers seem
like an overkill for this.

-- 
Martin K. Petersen      Oracle Linux Engineering
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