api/client: have cli.call() return headers

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)
Upstream-commit: 0cdc3b7539b618778becf233157604698b4e8281
Component: engine

components/engine/api/client/version.go

@@ -36,7 +36,7 @@ func (cli *DockerCli) CmdVersion(args ...string) error {
 		fmt.Fprintf(cli.out, "Experimental (client): true\n")
 	}
 
-	stream, _, err := cli.call("GET", "/version", nil, nil)
+	stream, _, _, err := cli.call("GET", "/version", nil, nil)
 	if err != nil {
 		return err
 	}