devtool: finish: fix erroneously creating bbappend for relative paths

After OE-Core rev 5e3fe00a0233d563781849a44f53885b4e924a9c we call
os.path.abspath() on the original layer path, but we later compare that
to the destination layer path. If that layer path isn't absolute but is
effectively the same path, it should be writing to the original recipe
but because we weren't making it absolute we were writing a bbappend
instead. Call os.path.abspath() on the destination path as well to avoid
that.

(From OE-Core rev: a85a78dcf226d160e9b504bfa67b306a9175ac29)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/devtool/standard.py

@@ -1861,9 +1861,7 @@ def _get_layer(layername, d):
         layerdir = layers.get('meta', None)
     else:
         layerdir = layers.get(layername, None)
-    if layerdir:
-        layerdir = os.path.abspath(layerdir)
-    return layerdir or layername
+    return os.path.abspath(layerdir or layername)
 
 def finish(args, config, basepath, workspace):
     """Entry point for the devtool 'finish' subcommand"""