tetragon: Cleanup tgids array before another round of events iteration

We might not get all events immediately on the first events iteration,
so there needs to be another round.

In that case we need to zero tgids array and return an error, so the
checker knows we failed and starts another events iteration.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>

pkg/sensors/exec/exec_test.go

@@ -209,11 +209,22 @@ func TestEventExitThreads(t *testing.T) {
 		}
 	}
 
+	var seenAll bool
+
 	finalCheck := func(l *logrus.Logger) error {
 		// Make sure we saw all pids
 		for pid, used := range tgids {
-			assert.True(t, used, "did not see exit event for pid %d", pid)
+			if !used {
+				t.Logf("Did not see exit event for pid %d", pid)
+
+				// Cleanup the 'seen' tgids for one more events iteration
+				for pid := range tgids {
+					tgids[pid] = false
+				}
+				return fmt.Errorf("final check failed")
+			}
 		}
+		seenAll = true
 		return nil
 	}
 
@@ -226,6 +237,8 @@ func TestEventExitThreads(t *testing.T) {
 
 	err = jsonchecker.JsonTestCheck(t, checker)
 	assert.NoError(t, err)
+
+	assert.True(t, seenAll, "did not see all exit events")
 }
 
 func TestEventExecve(t *testing.T) {