dm thin: initialize dm_thin_new_mapping returned by get_next_mapping
As additional members are added to the dm_thin_new_mapping structure care should be taken to make sure they get initialized before use. Signed-off-by: NMike Snitzer <snitzer@redhat.com> Acked-by: NJoe Thornber <ejt@redhat.com> Cc: stable@vger.kernel.org
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