[PATCH] Input: joystick - fix Kconfig warning for JOYSTICK_ADC

[Randy Dunlap]

Fix a Kconfig warning for JOYSTICK_ADC by also selecting
IIO_BUFFER.

WARNING: unmet direct dependencies detected for IIO_BUFFER_CB
  Depends on [n]: IIO [=y] && IIO_BUFFER [=n]
  Selected by [y]:
  - JOYSTICK_ADC [=y] && INPUT [=y] && INPUT_JOYSTICK [=y] && IIO [=y]

Fixes: 2c2b364fddd5 ("Input: joystick - add ADC attached joystick driver.")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Cc: Artur Rojek <contact@xxxxxxxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: linux-input@xxxxxxxxxxxxxxx
Cc: Paul Gazzillo <paul@xxxxxxxxx>
Cc: Necip Fazil Yildiran <fazilyildiran@xxxxxxxxx>
---
 drivers/input/joystick/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff -- a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -46,6 +46,7 @@ config JOYSTICK_A3D
 config JOYSTICK_ADC
 	tristate "Simple joystick connected over ADC"
 	depends on IIO
+	select IIO_BUFFER
 	select IIO_BUFFER_CB
 	help
 	  Say Y here if you have a simple joystick connected over ADC.