Removed ref from to_string_ in ansicolor sink

src/sinks/ansicolor_sink.cpp

@@ -87,7 +87,7 @@ void ansicolor_sink<Mutex>::flush_() {
 }
 
 template <typename Mutex>
-void ansicolor_sink<Mutex>::print_ccode_(const string_view_t &color_code) {
+void ansicolor_sink<Mutex>::print_ccode_(const string_view_t color_code) {
     fwrite(color_code.data(), sizeof(char), color_code.size(), target_file_);
 }
 
@@ -97,7 +97,7 @@ void ansicolor_sink<Mutex>::print_range_(const memory_buf_t &formatted, size_t s
 }
 
 template <typename Mutex>
-std::string ansicolor_sink<Mutex>::to_string_(const string_view_t &sv) {
+std::string ansicolor_sink<Mutex>::to_string_(const string_view_t sv) {
     return {sv.data(), sv.size()};
 }