PlaylistError: convert playlist_result to a strictly-typed enum

src/PlaylistError.hxx

@@ -22,18 +22,18 @@
 
 class Domain;
 
-enum playlist_result {
-	PLAYLIST_RESULT_SUCCESS,
-	PLAYLIST_RESULT_ERRNO,
-	PLAYLIST_RESULT_DENIED,
-	PLAYLIST_RESULT_NO_SUCH_SONG,
-	PLAYLIST_RESULT_NO_SUCH_LIST,
-	PLAYLIST_RESULT_LIST_EXISTS,
-	PLAYLIST_RESULT_BAD_NAME,
-	PLAYLIST_RESULT_BAD_RANGE,
-	PLAYLIST_RESULT_NOT_PLAYING,
-	PLAYLIST_RESULT_TOO_LARGE,
-	PLAYLIST_RESULT_DISABLED,
+enum class PlaylistResult {
+	SUCCESS,
+	ERRNO,
+	DENIED,
+	NO_SUCH_SONG,
+	NO_SUCH_LIST,
+	LIST_EXISTS,
+	BAD_NAME,
+	BAD_RANGE,
+	NOT_PLAYING,
+	TOO_LARGE,
+	DISABLED,
 };
 
 extern const Domain playlist_domain;