Change to song to address warning fix

src/song.rs

@@ -104,10 +104,10 @@ impl Song {
 
     pub fn song_path(&self) -> Result<String, std::io::Error> {
         if self.directory.is_empty() {
-            Err(std::io::Error::new(
+            return Err(std::io::Error::new(
                 std::io::ErrorKind::Other,
                 "Directory does not exist",
-            ))
+            ));
         }
 
         let directory = &self.directory;