Since iSER was converted to use the generic virt_boundary mechanism
(which was called something else in 4.4), it didn't handle the case
where a request is using up the full size of max_hw_segments, but
not actually aligned to the virt boundary.  This series sets the
maximum segment size limit to fix this workload (xfs_repair is a good
reproducer, btw).

Should probably go into 4.4 and 4.5-stable.

Changes since V1:
 - use min_not_zero
 - use SIZE_4K instead of PAGE_SIZE in iser

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