staging: comedi: pcl711: use cfc_check_trigger_arg_*() helpers

Use the new helpers in the step 3 tests of pcl711_ai_cmdtest().
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/pcl711.c

@@ -289,38 +289,24 @@ static int pcl711_ai_cmdtest(struct comedi_device *dev,
 	if (err)
 		return 2;
 
-	/* step 3 */
+	/* Step 3: check if arguments are trivially valid */
+
+	err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
 
-	if (cmd->start_arg != 0) {
-		cmd->start_arg = 0;
-		err++;
-	}
 	if (cmd->scan_begin_src == TRIG_EXT) {
-		if (cmd->scan_begin_arg != 0) {
-			cmd->scan_begin_arg = 0;
-			err++;
-		}
+		err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
 	} else {
 #define MAX_SPEED 1000
 #define TIMER_BASE 100
-		if (cmd->scan_begin_arg < MAX_SPEED) {
-			cmd->scan_begin_arg = MAX_SPEED;
-			err++;
-		}
-	}
-	if (cmd->convert_arg != 0) {
-		cmd->convert_arg = 0;
-		err++;
-	}
-	if (cmd->scan_end_arg != cmd->chanlist_len) {
-		cmd->scan_end_arg = cmd->chanlist_len;
-		err++;
+		err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
+						 MAX_SPEED);
 	}
+
+	err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
+	err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
+
 	if (cmd->stop_src == TRIG_NONE) {
-		if (cmd->stop_arg != 0) {
-			cmd->stop_arg = 0;
-			err++;
-		}
+		err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
 	} else {
 		/* ignore */
 	}