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: Felipe Balbi <balbi@ti.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index 38b0138..ee42797 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -566,7 +566,7 @@
 		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;