fix checkpatch --file mm/slub.c errors and warnings.

 $ q-code-quality-compare
                                      errors   lines of code   errors/KLOC
 mm/slub.c      [before]                  22            4204           5.2
 mm/slub.c      [after]                    0            4210             0

no code changed:

    text    data     bss     dec     hex filename
   22195    8634     136   30965    78f5 slub.o.before
   22195    8634     136   30965    78f5 slub.o.after

   md5:
     93cdfbec2d6450622163c590e1064358  slub.o.before.asm
     93cdfbec2d6450622163c590e1064358  slub.o.after.asm

[clameter: rediffed against Pekka's cleanup patch, omitted
moves of the name of a function to the start of line]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Christoph Lameter <clameter@sgi.com>