Merge "Fix teardown crash when kernel version < 5.4" am: 03c8a7a6a1

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2061767

Change-Id: I13b8706fbf1c7ff5c4392acfff52dde3871b0835
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/tests/cts/net/src/android/net/cts/DscpPolicyTest.kt b/tests/cts/net/src/android/net/cts/DscpPolicyTest.kt
index 9cd8418..e8add6b 100644
--- a/tests/cts/net/src/android/net/cts/DscpPolicyTest.kt
+++ b/tests/cts/net/src/android/net/cts/DscpPolicyTest.kt
@@ -146,6 +146,9 @@
 
     @After
     fun tearDown() {
+        if (!kernelIsAtLeast(5, 4)) {
+            return;
+        }
         agentsToCleanUp.forEach { it.unregister() }
         callbacksToCleanUp.forEach { cm.unregisterNetworkCallback(it) }