[PATCH] platform/x86: dell: fix DELL_WMI_PRIVACY dependencies & build error

[Randy Dunlap]

When DELL_WMI=y, DELL_WMI_PRIVACY=y, and LEDS_TRIGGER_AUDIO=m, there
is a linker error since the LEDS trigger code is built as a loadable
module. This happens because DELL_WMI_PRIVACY is a bool that depends
on a tristate (LEDS_TRIGGER_AUDIO=m), which can be dangerous.

ld: drivers/platform/x86/dell/dell-wmi-privacy.o: in function `dell_privacy_wmi_probe':
dell-wmi-privacy.c:(.text+0x3df): undefined reference to `ledtrig_audio_get'

Fixes: 8af9fa37b8a3 ("platform/x86: dell-privacy: Add support for Dell hardware privacy")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Perry Yuan <Perry.Yuan@xxxxxxxx>
Cc: Dell.Client.Kernel@xxxxxxxx
Cc: platform-driver-x86@xxxxxxxxxxxxxxx
Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
Cc: Mark Gross <mgross@xxxxxxxxxxxxxxx>
---
 drivers/platform/x86/dell/Kconfig |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- linux-next-20210917.orig/drivers/platform/x86/dell/Kconfig
+++ linux-next-20210917/drivers/platform/x86/dell/Kconfig
@@ -166,8 +166,7 @@ config DELL_WMI
 
 config DELL_WMI_PRIVACY
 	bool "Dell WMI Hardware Privacy Support"
-	depends on DELL_WMI
-	depends on LEDS_TRIGGER_AUDIO
+	depends on LEDS_TRIGGER_AUDIO = y || DELL_WMI = LEDS_TRIGGER_AUDIO
 	help
 	  This option adds integration with the "Dell Hardware Privacy"
 	  feature of Dell laptops to the dell-wmi driver.