kconfig: fix make oldconfig

Linus wrote:
This seems to make "make oldconfig" a _lot_ more verbose than it
used to be. In a very annoying way.

I just did a quick git bisect. It's introduced by commit 4062f1a4c030
("kconfig: use long options in conf") by Sam Ravnborg. Apparently that
thing is totally buggy, and doesn't just change the option names, but
actively breaks them.

The old behaviour (from years ago) were reintroduced by accident. Fix
this so we are back to the version that are silent if there is nothing
to ask about.

Reported-by: Linus Torvalds <[e-mail]>
Signed-off-by: Sam Ravnborg <[e-mail]>
Reviewed-by: Michal Marek <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

scripts/kconfig/conf.c

···
 		break;
 	case savedefconfig:
 		break;
-	case oldconfig:
 	case oldaskconfig:
 		rootEntry = &rootmenu;
 		conf(&rootmenu);
 		input_mode = silentoldconfig;
 		/* fall through */
+	case oldconfig:
 	case listnewconfig:
 	case oldnoconfig:
 	case silentoldconfig: