when the daemon can't download the image from a `docker import` the
error message was lost due to 'err' being redefined with a block by
mistake. This removes the ":" from "... err := " which fixes it.
Signed-off-by: Doug Davis <dug@us.ibm.com>
Upstream-commit: 3f4926e49b5f6df00ca09328e990729e00cb1a92
Component: engine