Patch to make the configure flag for mpd-mad and mpd-libid3tag more logic (from ticho)

git-svn-id: https://svn.musicpd.org/mpd/trunk@3477 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/inputPlugins/mp3_plugin.c

@@ -756,6 +756,9 @@ MpdTag * mp3_tagDup(char * file) {
 		if(!ret) ret = newMpdTag();
 		ret->time = time;
 	}
+	else {
+		DEBUG("mp3_tagDup: Failed to get total song time from: %s\n", file);
+	}
 
 	return ret;
 }