The distribution identifier is often used to create filenames, so it needs to be
safe to use as a filename. Whilst most distributions have e.g. Fedora or Debian
as their name, it is possible that the name contains special characters.
To ensure this doesn't cause a problem strip out any non-alphanumerics from the
distribution name before returning it.
[ YOCTO #9443 ]
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
