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

Use the new helpers in the step 3 tests of ni_tio_cmdtest().

Note that cmd->stop_src only has one trigger source so the extra
test is not required.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_tiocmd.c

@@ -275,37 +275,19 @@ int ni_tio_cmdtest(struct ni_gpct *counter, struct comedi_cmd *cmd)
 	if (err)
 		return 2;
 
-	/* step 3: make sure arguments are trivially compatible */
-	if (cmd->start_src != TRIG_EXT) {
-		if (cmd->start_arg != 0) {
-			cmd->start_arg = 0;
-			err++;
-		}
-	}
-	if (cmd->scan_begin_src != TRIG_EXT) {
-		if (cmd->scan_begin_arg) {
-			cmd->scan_begin_arg = 0;
-			err++;
-		}
-	}
-	if (cmd->convert_src != TRIG_EXT) {
-		if (cmd->convert_arg) {
-			cmd->convert_arg = 0;
-			err++;
-		}
-	}
+	/* Step 3: check if arguments are trivially valid */
 
-	if (cmd->scan_end_arg != cmd->chanlist_len) {
-		cmd->scan_end_arg = cmd->chanlist_len;
-		err++;
-	}
+	if (cmd->start_src != TRIG_EXT)
+		err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
 
-	if (cmd->stop_src == TRIG_NONE) {
-		if (cmd->stop_arg != 0) {
-			cmd->stop_arg = 0;
-			err++;
-		}
-	}
+	if (cmd->scan_begin_src != TRIG_EXT)
+		err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
+
+	if (cmd->convert_src != TRIG_EXT)
+		err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
+
+	err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
+	err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
 
 	if (err)
 		return 3;