media/radio: Make radio_isa_common_remove() return void

Instead of an unconditional return 0, return no value. One of the two
callers ignored the return value already before.

This simplifies the next patch.

Signed-off-by: Uwe Kleine-König <[e-mail]>
Reviewed-by: Hans Verkuil <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

drivers/media/radio/radio-isa.c

···
 	return res;
 }
 
-static int radio_isa_common_remove(struct radio_isa_card *isa,
-				   unsigned region_size)
+static void radio_isa_common_remove(struct radio_isa_card *isa,
+				    unsigned region_size)
 {
 	const struct radio_isa_ops *ops = isa->drv->ops;
 
···
 	release_region(isa->io, region_size);
 	v4l2_info(&isa->v4l2_dev, "Removed radio card %s\n", isa->drv->card);
 	kfree(isa);
-	return 0;
 }
 
 int radio_isa_probe(struct device *pdev, unsigned int dev)
···
 {
 	struct radio_isa_card *isa = dev_get_drvdata(pdev);
 
-	return radio_isa_common_remove(isa, isa->drv->region_size);
+	radio_isa_common_remove(isa, isa->drv->region_size);
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(radio_isa_remove);