looks like you did :
if so then no big deal because by default there is nothing in /root expect the conf files/folders starts with ( . )

but if you did sudo gainroot instead then it would be a bigger problem but you said you have your MyDocs so it's fine

in short : you were luck you wasn't in place else than empty /root/
you don't need a reflash
how ever it's recommended to check your backup grabbed from backupmenu (if you have one) and restore (if any missing files from N900 are in it)