json.hh: Fix shadowing arg

json.hh:39:42: warning: declaration of ‘what’ shadows a member of 'this' [-Wshadow]

diff --git a/pdns/json.hh b/pdns/json.hh
index 69deb48faf68d7a8ae10fea1b10c6aa9ed937e2f..12cda8eea1af1a01d1f324841d6b517677d00ddb 100644 (file)
--- a/pdns/json.hh
+++ b/pdns/json.hh
@@ -36,6 +36,6 @@ bool boolFromJson(const json11::Json container, const std::string& key, const bo
 class JsonException : public std::runtime_error
 {
 public:
-  JsonException(const std::string& what) : std::runtime_error(what) {
+  JsonException(const std::string& what_arg) : std::runtime_error(what_arg) {
   }
 };