Response status code needs to be checked after unauthorized

[stevvooe]

Please see this code: https://github.com/docker/engine-api/blob/master/client/image_pull.go#L30. The status code is not checked after running privilegeFunc. This could return a completely invalid body and result in undetectable error.

I'm not sure about a fix since it is not entirely clear what this code is supposed to be doing. Why wouldn't privilegeFunc be called on the first time through?

[coreydaley]

Looks like it's on line 35 now, and still exists in https://github.com/moby/moby/blob/master/client/image_pull.go