fpga: altera-pr-ip: Make alt_pr_unregister function void

Make alt_pr_unregister function void, since it always returns 0,
and nothing would act on the value anyways.
Signed-off-by: Moritz Fischer <mdf@kernel.org>

drivers/fpga/altera-pr-ip-core-plat.c

@@ -32,7 +32,9 @@ static int alt_pr_platform_remove(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 
-	return alt_pr_unregister(dev);
+	alt_pr_unregister(dev);
+
+	return 0;
 }
 
 static const struct of_device_id alt_pr_of_match[] = {

drivers/fpga/altera-pr-ip-core.c

@@ -201,15 +201,13 @@ int alt_pr_register(struct device *dev, void __iomem *reg_base)
 }
 EXPORT_SYMBOL_GPL(alt_pr_register);
 
-int alt_pr_unregister(struct device *dev)
+void alt_pr_unregister(struct device *dev)
 {
 	struct fpga_manager *mgr = dev_get_drvdata(dev);
 
 	dev_dbg(dev, "%s\n", __func__);
 
 	fpga_mgr_unregister(mgr);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(alt_pr_unregister);
 

include/linux/fpga/altera-pr-ip-core.h

@@ -13,6 +13,6 @@
 #include <linux/io.h>
 
 int alt_pr_register(struct device *dev, void __iomem *reg_base);
-int alt_pr_unregister(struct device *dev);
+void alt_pr_unregister(struct device *dev);
 
 #endif /* _ALT_PR_IP_CORE_H */