Anusha Ragunathan 711fedae4a Return pipeline errors correctly.
To use a deferred func to overwrite the returned error requires using
the 'named' error. So reuse err, instead of pipelineError. Also, the old
pipelineError will never be nil, since its executed before the error can
be set.

Signed-off-by: Anusha Ragunathan <anusha@docker.com>
Upstream-commit: af2e2562494a11ee8e6ede58a29cc250935e74c4
Component: engine
2016-09-23 13:09:56 -07:00
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