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/info.go

@@ -18,7 +18,7 @@ func (cli *DockerCli) CmdInfo(args ...string) error {
 	cmd.Require(flag.Exact, 0)
 	cmd.ParseFlags(args, true)
 
-	rdr, _, err := cli.call("GET", "/info", nil, nil)
+	rdr, _, _, err := cli.call("GET", "/info", nil, nil)
 	if err != nil {
 		return err
 	}