ACPI/IORT: Fix the indentation in iort_scan_node()

The indentation in the iort_scan_node() function is wrong, fix it.
Signed-off-by: NHanjun Guo <hanjun.guo@linaro.org>
[lorenzo.pieralisi@arm.com: massaged commit log]
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: NMing Lei <ming.lei@canonical.com>
Tested-by: NWei Xu <xuwei5@hisilicon.com>
Tested-by: NSinan Kaya <okaya@codeaurora.org>