HID: picoLCD: Deletion of unnecessary checks before three function calls

The functions backlight_device_unregister(), lcd_device_unregister() and
rc_unregister_device() test whether their argument is NULL and then
return immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <[e-mail]>
Reviewed-by: Bruno Prémont <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/hid-picolcd_backlight.c

···
 	struct backlight_device *bdev = data->backlight;
 
 	data->backlight = NULL;
-	if (bdev)
-		backlight_device_unregister(bdev);
+	backlight_device_unregister(bdev);
 }
 
 int picolcd_resume_backlight(struct picolcd_data *data)

drivers/hid/hid-picolcd_cir.c

···
 	struct rc_dev *rdev = data->rc_dev;
 
 	data->rc_dev = NULL;
-	if (rdev)
-		rc_unregister_device(rdev);
+	rc_unregister_device(rdev);
 }
 

drivers/hid/hid-picolcd_lcd.c

···
 	struct lcd_device *ldev = data->lcd;
 
 	data->lcd = NULL;
-	if (ldev)
-		lcd_device_unregister(ldev);
+	lcd_device_unregister(ldev);
 }
 
 int picolcd_resume_lcd(struct picolcd_data *data)