added a perror()

diff --git a/comedi_calibrate/save_cal.c b/comedi_calibrate/save_cal.c
index 3c2748856b0356b181623138075b9269e159c488..521f0a39a1c4c585841f870bd707b9bf194c511d 100644 (file)
--- a/comedi_calibrate/save_cal.c
+++ b/comedi_calibrate/save_cal.c
@@ -127,6 +127,7 @@ int write_calibration_file( calibration_setup_t *setup )
        {
                fprintf( stderr, "failed to open file %s for writing\n",
                        setup->cal_save_file_path );
+               perror( "fopen" );
                return -1;
        }