decoder/mikmod: fix memory leak

The return value of Player_LoadTitle() is allocated with malloc(), and
must be freed by the caller.

NEWS

@@ -39,6 +39,7 @@ ver 0.16 (20??/??/??)
   - wavpack: allow more than 2 channels
   - mp4ff: rename plugin "mp4" to "mp4ff"
   - mp4ff: support tags "albumartist", "band"
+  - mikmod: fix memory leak
 * encoders:
   - twolame: new encoder plugin based on libtwolame
   - flac: new encoder plugin based on libFLAC

src/decoder/mikmod_decoder_plugin.c

@@ -195,11 +195,13 @@ mikmod_decoder_tag_dup(const char *path_fs)
 
 	tag->time = 0;
 
-	char *title = g_strdup(Player_LoadTitle(path2));
+	char *title = Player_LoadTitle(path2);
 	g_free(path2);
 
-	if (title)
+	if (title != NULL) {
 		tag_add_item(tag, TAG_TITLE, title);
+		free(title);
+	}
 
 	return tag;
 }