Merge pull request open-source-parsers#454 from cbeiraod/master

Small fix for strict compilers (using the flag -Werror for instance)

Author: cdunn2001

src/lib_json/json_value.cpp

@@ -157,7 +157,7 @@ static inline void releaseStringValue(char* value, unsigned length) {
 static inline void releasePrefixedStringValue(char* value) {
   free(value);
 }
-static inline void releaseStringValue(char* value, unsigned length) {
+static inline void releaseStringValue(char* value, unsigned) {
   free(value);
 }
 #endif // JSONCPP_USING_SECURE_MEMORY