Windows: Security warning based on server OS

Signed-off-by: John Howard <jhoward@microsoft.com>
Upstream-commit: 126529c6d0a20675de8f50939c57f23259d3e763
Component: engine

components/engine/api/client/import.go

@@ -71,5 +71,6 @@ func (cli *DockerCli) CmdImport(args ...string) error {
 		out:         cli.out,
 	}
 
-	return cli.stream("POST", "/images/create?"+v.Encode(), sopts)
+	_, err := cli.stream("POST", "/images/create?"+v.Encode(), sopts)
+	return err
 }