dm era: Fix bitset memory leaks
Deallocate the memory allocated for the in-core bitsets when destroying the target and in error paths. Fixes: eec40579 ("dm: add era target") Cc: stable@vger.kernel.org # v3.15+ Signed-off-by: NNikos Tsironis <ntsironis@arrikto.com> Reviewed-by: NMing-Hung Tsai <mtsai@redhat.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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