Inline some variables

There is no point in `Type a = …; return a;`

airsonic-main/src/main/java/org/airsonic/player/domain/TransferStatus.java

@@ -281,9 +281,8 @@ public class TransferStatus {
 
     @Override
     public String toString() {
-        String builder = "TransferStatus-" + hashCode() + " [player: " + player.getId() + ", file: " +
+        return "TransferStatus-" + hashCode() + " [player: " + player.getId() + ", file: " +
                 file + ", terminated: " + terminated + ", active: " + active + "]";
-        return builder;
     }
 
     /**

airsonic-main/src/main/java/org/airsonic/player/service/playlist/XspfPlaylistExportHandler.java

@@ -31,8 +31,7 @@ public class XspfPlaylistExportHandler implements PlaylistExportHandler {
 
     @Override
     public SpecificPlaylist handle(int id, SpecificPlaylistProvider provider) throws Exception {
-        chameleon.playlist.xspf.Playlist playlist = createXsfpPlaylistFromDBId(id);
-        return playlist;
+        return createXsfpPlaylistFromDBId(id);
     }
 
     chameleon.playlist.xspf.Playlist createXsfpPlaylistFromDBId(int id) {

airsonic-main/src/main/java/org/airsonic/player/service/upnp/PlaylistUpnpProcessor.java

@@ -56,8 +56,7 @@ public class PlaylistUpnpProcessor extends UpnpContentProcessor <Playlist, Media
     }
 
     public List<Playlist> getAllItems() {
-        List<Playlist> playlists = getPlaylistService().getAllPlaylists();
-        return playlists;
+        return getPlaylistService().getAllPlaylists();
     }
 
     public Playlist getItemById(String id) throws Exception {

airsonic-main/src/test/java/org/airsonic/player/TestCaseUtils.java

@@ -79,11 +79,9 @@ public class TestCaseUtils {
                     "from information_schema.system_tables " +
                     "where table_name not like 'SYSTEM%'"
             , String.class);
-    Map<String, Integer> nbRecords =
-            tableNames.stream()
-                    .collect(Collectors.toMap(table -> table, table -> recordsInTable(table,daoHelper)));
 
-    return nbRecords;
+      return tableNames.stream()
+              .collect(Collectors.toMap(table -> table, table -> recordsInTable(table,daoHelper)));
   }
 
   /**

airsonic-main/src/test/java/org/airsonic/player/dao/MusicFolderTestData.java

@@ -12,8 +12,7 @@ public class MusicFolderTestData {
   private static String baseResources = "/MEDIAS/";
 
   public static String resolveBaseMediaPath() {
-    String baseDir = MusicFolderTestData.class.getResource(baseResources).toString().replace("file:","");
-    return baseDir;
+    return MusicFolderTestData.class.getResource(baseResources).toString().replace("file:","");
   }
 
   public static String resolveMusicFolderPath() {