From 0f20972f7bf6922df49ef7ce7a6df802347d2c52 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Tue, 28 Apr 2015 11:50:29 -0400
Subject: [PATCH] dm: factor out a common cleanup_mapped_device()

Introduce a single common method for cleaning up a DM device's
mapped_device.  No functional change, just eliminates duplication of
delicate mapped_device cleanup code.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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