drivers/rtc/rtc-ds1374.c: add CONFIG_PM_SLEEP to suspend/resume functions

Add CONFIG_PM_SLEEP to suspend/resume functions to fix the following
build warning when CONFIG_PM_SLEEP is not selected.  This is because
sleep PM callbacks defined by SIMPLE_DEV_PM_OPS are only used when the
CONFIG_PM_SLEEP is enabled.

  drivers/rtc/rtc-ds1374.c:413:12: warning: 'ds1374_suspend' defined but not used [-Wunused-function]
  drivers/rtc/rtc-ds1374.c:422:12: warning: 'ds1374_resume' defined but not used [-Wunused-function]
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-ds1374.c

@@ -409,7 +409,7 @@ static int ds1374_remove(struct i2c_client *client)
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int ds1374_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
@@ -427,19 +427,15 @@ static int ds1374_resume(struct device *dev)
 		disable_irq_wake(client->irq);
 	return 0;
 }
+#endif
 
 static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
 
-#define DS1374_PM (&ds1374_pm)
-#else
-#define DS1374_PM NULL
-#endif
-
 static struct i2c_driver ds1374_driver = {
 	.driver = {
 		.name = "rtc-ds1374",
 		.owner = THIS_MODULE,
-		.pm = DS1374_PM,
+		.pm = &ds1374_pm,
 	},
 	.probe = ds1374_probe,
 	.remove = ds1374_remove,