[PATCH] usb: Add missing guard around env_get() in usb_hub

[Fabio Estevam]

Hi Marek,

On Mon, Sep 19, 2022 at 4:19 PM Marek Vasut <marex at denx.de> wrote:
>
> The env_get() might be undefined in case ENV_SUPPORT is disabled,
> which may happen e.g. in SPL. Add missing ifdef guard around the
> env_get() to prevent build failure.

Yes, this fixes a build failure when adding imx8mm-evk SDP SPL support, thanks:

Tested-by: Fabio Estevam <festevam at denx.de>