tidy-fix automàtic (sense naming)

source/game/scenes/scene_utils.cpp

@@ -7,7 +7,7 @@
 namespace scenes {
 
     namespace {
-        std::string basename(const char* path) {
+        auto basename(const char* path) -> std::string {
             std::string s = path;
             auto pos = s.find_last_of("/\\");
             return pos == std::string::npos ? s : s.substr(pos + 1);
@@ -15,7 +15,9 @@ namespace scenes {
     }  // namespace
 
     void playMusic(const char* filename, int loop) {
-        if (!filename) return;
+        if (filename == nullptr) {
+            return;
+        }
         Audio::get()->playMusic(basename(filename), loop);
     }