sigrok plugin: constify

[collectd.git] / src / sigrok.c

diff --git a/src/sigrok.c b/src/sigrok.c
index 1a0536a..ad5c70c 100644 (file)
--- a/src/sigrok.c
+++ b/src/sigrok.c
@@ -1,6 +1,6 @@
 /*
  * collectd - src/sigrok.c
- * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
+ * Copyright (C) 2013 Bert Vermeulen
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -14,6 +14,9 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Bert Vermeulen <bert at biot.com>
  */
 
 #include "collectd.h"
@@ -133,9 +136,9 @@ static int sigrok_config(oconfig_item_t *ci)
        return 0;
 }
 
-static char *sigrok_value_type(const struct sr_datafeed_analog *analog)
+static const char *sigrok_value_type(const struct sr_datafeed_analog *analog)
 {
-       char *s;
+       const char *s;
 
        if (analog->mq == SR_MQ_VOLTAGE)
                s = "voltage";