ASoC: e740_wm9705 - free gpio in e740_exit()

In e740_init(), we call gpio_request() for
GPIO_E740_MIC_ON, GPIO_E740_AMP_ON and GPIO_E740_WM9705_nAVDD2.
We should free the these gpio accordingly in e740_exit().

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/pxa/e740_wm9705.c

@@ -198,6 +198,9 @@ free_mic_amp_gpio:
 static void __exit e740_exit(void)
 {
 	platform_device_unregister(e740_snd_device);
+	gpio_free(GPIO_E740_WM9705_nAVDD2);
+	gpio_free(GPIO_E740_AMP_ON);
+	gpio_free(GPIO_E740_MIC_ON);
 }
 
 module_init(e740_init);