Fix a few issues reported by static analyzers

src/config/config.cpp

@@ -28,13 +28,6 @@ int Config::get_int(const std::string& option, const int& def)
     return def;
 }
 
-void Config::set_int(const std::string& option, const int& value, bool save)
-{
-  std::ostringstream os;
-  os << value;
-  Config::set(option, os.str(), save);
-}
-
 void Config::set(const std::string& option, const std::string& value, bool save)
 {
   Config* self = Config::instance().get();

src/config/config.hpp

@@ -52,14 +52,6 @@ public:
    * @param save if true, save the config file
    */
   static void set(const std::string&, const std::string&, bool save = false);
-  /**
-   * Set a value for the given option. And write all the config
-   * in the file from which it was read if boolean is set.
-   * @param option The option to set
-   * @param value The value to use
-   * @param save if true, save the config file
-   */
-  static void set_int(const std::string&, const int&, bool save = false);
   /**
    * Adds a function to a list. This function will be called whenever a
    * configuration change occurs.