x86: coding style fixes to arch/x86/kernel/cpu/common.c

Before:
   total: 55 errors, 6 warnings, 727 lines checked
After:
   total: 0 errors, 3 warnings, 734 lines checked

No code changed:

arch/x86/kernel/cpu/common.o:

   text	   data	    bss	    dec	    hex	filename
   3500	   4611	     44	   8155	   1fdb	common.o.before
   3500	   4611	     44	   8155	   1fdb	common.o.after

md5:
   e37091f11fbeb682c0db152ac3022a38  common.o.before.asm
   e37091f11fbeb682c0db152ac3022a38  common.o.after.asm

Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>