dm exception store: fix exstore lookup to be case insensitive
When snapshots are created using 'p' instead of 'P' as the exception store type, the device-mapper table loading fails. This patch makes the code case insensitive as intended and fixes some regressions reported with device-mapper snapshots. Signed-off-by: NJonathan Brassow <jbrassow@redhat.com> Cc: stable@kernel.org Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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