lib/oe/rootfs: Fix DEBUGFS generation, without openssl
In commit
20ea6d274bb0a9a5addb111f32793de49b907865, debugfs generation
for images using opkg, which included openssl was fixed.
However, that broke the generation of the opkg-based images, that lacks
openssl. The error is a python stack trace, showing that shutil.copytree
tries to copy a non-existing directory.
This relates to [YOCTO #9040].
Signed-off-by: Anders Darander <anders@chargestorm.se>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>