dm exception store: refactor zero_area
Use a separate buffer for writing zeroes to the on-disk snapshot exception store, make the updating of ps->current_area explicit and refactor the code in preparation for the fix in the next patch. No functional change. Signed-off-by: NAlasdair G Kergon <agk@redhat.com> Signed-off-by: NMikulas Patocka <mpatocka@redhat.com> Cc: stable@kernel.org
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