[PATCH] macintosh/ams: Fix unused variable warning

[Michael Ellerman]

If both CONFIG_SENSORS_AMS_PMU and CONFIG_SENSORS_AMS_I2C are unset,
there is an unused variable warning in the ams driver:

  drivers/macintosh/ams/ams-core.c: In function 'ams_init':
  drivers/macintosh/ams/ams-core.c:181:29: warning: unused variable 'np'
    181 |         struct device_node *np;

The driver needs at least one of the configs enabled in order to
actually function. So fix the compiler warning by ensuring at least one
of the configs is enabled.

Suggested-by: Christophe Leroy <christophe.leroy at csgroup.eu>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 drivers/macintosh/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig
index a0e717a986dc..fb38f684444f 100644
--- a/drivers/macintosh/Kconfig
+++ b/drivers/macintosh/Kconfig
@@ -262,7 +262,7 @@ config SENSORS_AMS
 	  will be called ams.
 
 config SENSORS_AMS_PMU
-	bool "PMU variant"
+	bool "PMU variant" if SENSORS_AMS_I2C
 	depends on SENSORS_AMS && ADB_PMU
 	default y
 	help
-- 
2.45.0