gentree: create *.tar.gz instead of *.tar.bz for kernel.org

Upstream commit: e7ff81f2d7ff55bef128c0eacdc43f16080ec8a0

kernel.org does not support bzip2 any more, use gzip instead.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
1 file changed