fix check for presence of ao subdevice

diff --git a/comedi_calibrate/cal_common.c b/comedi_calibrate/cal_common.c
index 7f99c7a448de92468e5cb7540e705a4c82905994..57293968b8ee1001f39a3b2b5ad9b734847be38d 100644 (file)
--- a/comedi_calibrate/cal_common.c
+++ b/comedi_calibrate/cal_common.c
@@ -284,7 +284,7 @@ int generic_cal_by_channel_and_range( calibration_setup_t *setup,
        num_ai_channels = comedi_get_n_channels( setup->dev, setup->ad_subdev );
        if( num_ai_channels < 0 ) return -1;
 
-       if( setup->da_subdev && setup->do_output )
+       if(setup->da_subdev >= 0 && setup->do_output )
        {
                assert( comedi_range_is_chan_specific( setup->dev, setup->da_subdev ) == 0 );
 
@@ -363,7 +363,7 @@ int generic_cal_by_range( calibration_setup_t *setup,
        num_ai_ranges = comedi_get_n_ranges( setup->dev, setup->ad_subdev, 0 );
        if( num_ai_ranges < 0 ) return -1;
 
-       if( setup->da_subdev && setup->do_output )
+       if(setup->da_subdev >= 0 && setup->do_output )
        {
                assert( comedi_range_is_chan_specific( setup->dev, setup->da_subdev ) == 0 );
 
@@ -432,7 +432,7 @@ int generic_cal_ao(calibration_setup_t *setup,
        comedi_calibration_setting_t *current_cal;
 
 
-       if(setup->da_subdev && setup->do_output)
+       if(setup->da_subdev >= 0 && setup->do_output)
        {
                assert( comedi_range_is_chan_specific( setup->dev, setup->da_subdev ) == 0 );