ASoC: Check machine type before loading on AT91SAM9G20-EK

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/atmel/sam9g20_wm8731.c

@@ -45,6 +45,7 @@
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 
+#include <asm/mach-types.h>
 #include <mach/hardware.h>
 #include <mach/gpio.h>
 
@@ -268,6 +269,9 @@ static int __init at91sam9g20ek_init(void)
 	struct ssc_device *ssc = NULL;
 	int ret;
 
+	if (!machine_is_at91sam9g20ek())
+		return -ENODEV;
+
 	/*
 	 * Request SSC device
 	 */