drm/ssd130x: Make ssd130x_remove() return void

This function returns zero unconditionally, so there isn't any benefit
of returning a value. Make it return void to be able to see at a glance
that the return value of ssd130x_i2c_remove() is always zero.

This patch is a preparation for making i2c remove callbacks return void.

Signed-off-by: Uwe Kleine-König <[e-mail]>
Acked-by: Javier Martinez Canillas <[e-mail]>
Signed-off-by: Javier Martinez Canillas <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/solomon/ssd130x-i2c.c

···
 {
 	struct ssd130x_device *ssd130x = i2c_get_clientdata(client);
 
-	return ssd130x_remove(ssd130x);
+	ssd130x_remove(ssd130x);
+
+	return 0;
 }
 
 static void ssd130x_i2c_shutdown(struct i2c_client *client)

drivers/gpu/drm/solomon/ssd130x.c

···
 }
 EXPORT_SYMBOL_GPL(ssd130x_probe);
 
-int ssd130x_remove(struct ssd130x_device *ssd130x)
+void ssd130x_remove(struct ssd130x_device *ssd130x)
 {
 	drm_dev_unplug(&ssd130x->drm);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(ssd130x_remove);
 

drivers/gpu/drm/solomon/ssd130x.h

···
 extern const struct ssd130x_deviceinfo ssd130x_variants[];
 
 struct ssd130x_device *ssd130x_probe(struct device *dev, struct regmap *regmap);
-int ssd130x_remove(struct ssd130x_device *ssd130x);
+void ssd130x_remove(struct ssd130x_device *ssd130x);
 void ssd130x_shutdown(struct ssd130x_device *ssd130x);
 
 #endif /* __SSD1307X_H__ */