x86: more coding style fixes in centaur.c

no code changed:

 arch/x86/kernel/cpu/centaur.o:
    text    data     bss     dec     hex filename
    1031     324       0    1355     54b centaur.o.before
    1031     324       0    1355     54b centaur.o.after

 md5:
  4f306a7f980b58eb69c4bdcfcde565f1  centaur.o.before.asm
  4f306a7f980b58eb69c4bdcfcde565f1  centaur.o.after.asm

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>