[PATCH][NET] gianfar: fix obviously wrong #ifdef CONFIG_GFAR_NAPI placement

[Andy Whitcroft]

The check then is to see if a non {}'d block has no statements in it if the
ifdef is null.  Hmmm.  May be possible.  Will think on it.

        if (err)
+#ifdef CONFIG_GFAR_NAPI
                napi_disable(&priv->napi);
+#endif

-apw