Input: rotary_encoder - mark PM methods as __maybe_unused

Instead of guarding PM methods with #ifdef let's mark them as
__maybe_unused as it allows for better compile coverage.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/rotary_encoder.c

@@ -383,8 +383,7 @@ static int rotary_encoder_probe(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int rotary_encoder_suspend(struct device *dev)
+static int __maybe_unused rotary_encoder_suspend(struct device *dev)
 {
 	struct rotary_encoder *encoder = dev_get_drvdata(dev);
 
@@ -396,7 +395,7 @@ static int rotary_encoder_suspend(struct device *dev)
 	return 0;
 }
 
-static int rotary_encoder_resume(struct device *dev)
+static int __maybe_unused rotary_encoder_resume(struct device *dev)
 {
 	struct rotary_encoder *encoder = dev_get_drvdata(dev);
 
@@ -407,7 +406,6 @@ static int rotary_encoder_resume(struct device *dev)
 
 	return 0;
 }
-#endif
 
 static SIMPLE_DEV_PM_OPS(rotary_encoder_pm_ops,
 			 rotary_encoder_suspend, rotary_encoder_resume);