[Patch] thinkpad_acpi: fix a build error

[Amerigo Wang]

This patch fixes the following build error:

 Building modules, stage 2.
 MODPOST 1834 modules
ERROR: "snd_card_create" [drivers/platform/x86/thinkpad_acpi.ko] undefined!
ERROR: "snd_ctl_notify" [drivers/platform/x86/thinkpad_acpi.ko] undefined!
ERROR: "snd_ctl_boolean_mono_info" [drivers/platform/x86/thinkpad_acpi.ko] undefined!
ERROR: "snd_ctl_new1" [drivers/platform/x86/thinkpad_acpi.ko] undefined!
ERROR: "snd_card_free" [drivers/platform/x86/thinkpad_acpi.ko] undefined!
ERROR: "snd_card_register" [drivers/platform/x86/thinkpad_acpi.ko] undefined!
ERROR: "snd_ctl_add" [drivers/platform/x86/thinkpad_acpi.ko] undefined!

Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Corentin Chary <corentincj@xxxxxxxxxx>
Cc: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>
Cc: Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx>
Reported-by: Helight.Xu <helight.xu@xxxxxxxxx>
Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>
Tested-by: Helight.Xu <helight.xu@xxxxxxxxx>

---
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index fc5bf9d..596966c 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -215,6 +215,7 @@ config THINKPAD_ACPI
 	depends on ACPI
 	depends on INPUT
 	depends on RFKILL || RFKILL = n
+	depends on SOUND
 	select BACKLIGHT_LCD_SUPPORT
 	select BACKLIGHT_CLASS_DEVICE
 	select HWMON
--
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