Merge branch 'NetHack-3.6.0' of https://rodney.nethack.org:20040/git/NHsource into NetHack-3.6.0

src/vault.c

@@ -380,7 +380,7 @@ invault()
             getlin(Deaf ? "You are required to sign in with your name. -" :
                     "\"Hello stranger, who are you?\" -", buf);
             (void) mungspaces(buf);
-        } while (!letter(buf[0]) && --trycount > 0);
+        } while (!buf[0] && --trycount > 0);
 
         if (u.ualign.type == A_LAWFUL
             /* ignore trailing text, in case player includes rank */