[PATCH] image.bbclass: fix incomplete .rootfs customization

[Patrick Ohly <patrick.ohly@intel.com>]

The patch for making the .rootfs configurable was incomplete: in the
python create_symlinks() method the new variable must be expanded
explicitly.

Not doing so broke the symlink creation and that led to hard build
failures in image types depending on the boot-directdisk.bbclass (like
qcow2) because the build_boot_dd() method relied on the symlink.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
---
 meta/classes/image.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 081a0b3..8b6c30b 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -474,7 +474,7 @@ python create_symlinks() {
     manifest_name = d.getVar('IMAGE_MANIFEST', True)
     taskname = d.getVar("BB_CURRENTTASK", True)
     subimages = (d.getVarFlag("do_" + taskname, 'subimages', False) or "").split()
-    imgsuffix = d.getVarFlag("do_" + taskname, 'imgsuffix', True) or "${IMAGE_NAME_SUFFIX}."
+    imgsuffix = d.getVarFlag("do_" + taskname, 'imgsuffix', True) or d.expand("${IMAGE_NAME_SUFFIX}.")
     os.chdir(deploy_dir)
 
     if not link_name:
-- 
2.1.4