i386: Fix wrong CPU error message in early boot path

- boot/setup.S did not print "PANIC: CPU too old for this kernel"
  ( not visible, also the message did not match )
- I add "# missed before: set ds"
  => somebody should check if I am right with the way to set.
  => seems to be a generic error in setup.S not to set "ds" for error messages.

AK: extracted patch out of other changes
AK: also couldn't find any other case where ds is wrong
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/i386/boot/setup.S

@@ -310,6 +310,8 @@ loader_ok:
 	call verify_cpu
 	testl  %eax,%eax
 	jz	cpu_ok
+	movw	%cs,%ax		# aka SETUPSEG
+	movw	%ax,%ds
 	lea	cpu_panic_mess,%si
 	call	prtstr
 1:	jmp	1b