Ian Campbell d63d2ecf6c Simplify mount cleanup on failure by using defer ...

This avoids someone adding a new error path and forgetting to call the cleanup
function.

We prefer to use an explicit flag to gate the clean rather than relying on `err
!= nil` so we don't have to rely on people never accidentally shadowing the
`err` as seen by the closure.

Signed-off-by: Ian Campbell <ian.campbell@docker.com>

2017-07-20 10:50:08 +01:00

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