bugfix Test: Test Test_GetHeadstageForChannel checked against wrong result

Test_GetHeadstageForChannel checked for TTL channels for INDEP_HEADSTAGE as headstage
result, but it must be NaN as TTL channels are not associated.

Since
7bcf2c8 (Add LNB function support for TTL channels for read/write, 2023-07-05)

Author: MichaelHuth

Packages/tests/Basic/UTF_Labnotebook.ipf

@@ -847,7 +847,7 @@ static Function Test_GetHeadstageForChannel()
 
 	channel = 6
 	hs      = GetHeadstageForChannel(numericalValues, sweepNo, XOP_CHANNEL_TYPE_TTL, channel, DATA_ACQUISITION_MODE)
-	CHECK_EQUAL_VAR(hs, INDEP_HEADSTAGE)
+	CHECK_EQUAL_VAR(hs, NaN)
 	hs = GetHeadstageForChannel(numericalValues, sweepNo, XOP_CHANNEL_TYPE_DAC, channel, TEST_PULSE_MODE)
 	CHECK_EQUAL_VAR(hs, NaN)
 	hs = GetHeadstageForChannel(numericalValues, sweepNo, XOP_CHANNEL_TYPE_ADC, channel, UNKNOWN_MODE)