ethernet: 8390: remove unnecessary check of mem

The 'mem' returned by platform_get_resource() has been checked in probe
function, so it is no need do this check in remove function.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220927151406.797800-1-yangyingliang@huawei.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/8390/mcf8390.c

@@ -450,8 +450,7 @@ static int mcf8390_remove(struct platform_device *pdev)
 
 	unregister_netdev(dev);
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (mem)
-		release_mem_region(mem->start, resource_size(mem));
+	release_mem_region(mem->start, resource_size(mem));
 	free_netdev(dev);
 	return 0;
 }