htlcswitch: remove 5 second timeout for data race unit tests

htlcswitch/switch_test.go

@@ -3449,17 +3449,12 @@ func TestSwitchDustForwarding(t *testing.T) {
 	)
 	require.NoError(t, err)
 
-	select {
+	result, ok := <-carolResultChan
-	case result, ok := <-carolResultChan:
 	require.True(t, ok)
 	assertFailureCode(
 		t, result.Error, lnwire.CodeTemporaryChannelFailure,
 	)
 
-	case <-time.After(5 * time.Second):
-		t.Fatal("no result arrived for carol's dust htlc")
-	}
-
 	// Send an HTLC from Alice to Carol and assert that it is failed at the
 	// call to SendHTLC.
 	htlcAmt, totalTimelock, aliceHops := generateHops(