tests: add a testcase triggering https://github.com/systemd/systemd/issues/15968

It's just a follow-up to https://github.com/systemd/systemd/pull/15976

diff --git a/test/fuzz/fuzz-netdev-parser/github-15968 b/test/fuzz/fuzz-netdev-parser/github-15968
new file mode 100644 (file)
index 0000000..0527704
--- /dev/null
+++ b/test/fuzz/fuzz-netdev-parser/github-15968
@@ -0,0 +1,14 @@
+[NetDev]
+Name=t
+[L2TP]
+b
+Remote=1.8.0.2
+
+[L2TPSession]
+SessionId=
+[L2TP]
+PeerTunnelId=2
+[NetDev]
+Kind=l2tp
+[L2TP]
+TunnelId=4