Fix a dumb warning in garmin_txt.cc.

diff --git a/garmin_txt.cc b/garmin_txt.cc
index 5293eee28d40eae495894d75e5829a8825f644ee..d3fa8c4b178723dd70f1b45ca72dde0187fc3ea1 100644 (file)
--- a/garmin_txt.cc
+++ b/garmin_txt.cc
@@ -516,7 +516,7 @@ print_string(const char* fmt, const QString& string)
 {
   /* remove unwanted characters from source string */
   QString cleanstring;
-  for (const auto chr : string) {
+  for (const auto& chr : string) {
     if (chr.category() != QChar::Other_Control) {
       cleanstring.append(chr);
     } else {