w1: omap-hdq: don't hardcode resource size

we have the helpful resource_size() macro to
calculate the size of the memory resource for
us, let's use it.
Signed-off-by: NFelipe Balbi <balbi@ti.com>
Acked-by: NEvgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/w1/masters/omap_hdq.c

@@ -566,7 +566,7 @@ static int __devinit omap_hdq_probe(struct platform_device *pdev)
 		goto err_resource;
 	}
 
-	hdq_data->hdq_base = ioremap(res->start, SZ_4K);
+	hdq_data->hdq_base = ioremap(res->start, resource_size(res));
 	if (!hdq_data->hdq_base) {
 		dev_dbg(&pdev->dev, "ioremap failed\n");
 		ret = -EINVAL;