slab: avoid double initialization & do initialization in 1 place

- alloc_slabmgmt: initialize all slab fields in 1 place
- slab->nodeid was initialized twice: in alloc_slabmgmt
  and immediately after it in cache_grow
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
CC: Christoph Lameter <clameter@sgi.com>
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Christoph Lameter <clameter@sgi.com>

mm/slab.c

@@ -2630,6 +2630,7 @@ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp,
 	slabp->colouroff = colour_off;
 	slabp->s_mem = objp + colour_off;
 	slabp->nodeid = nodeid;
+	slabp->free = 0;
 	return slabp;
 }
 
@@ -2683,7 +2684,6 @@ static void cache_init_objs(struct kmem_cache *cachep,
 		slab_bufctl(slabp)[i] = i + 1;
 	}
 	slab_bufctl(slabp)[i - 1] = BUFCTL_END;
-	slabp->free = 0;
 }
 
 static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags)
@@ -2816,7 +2816,6 @@ static int cache_grow(struct kmem_cache *cachep,
 	if (!slabp)
 		goto opps1;
 
-	slabp->nodeid = nodeid;
 	slab_map_pages(cachep, slabp, objp);
 
 	cache_init_objs(cachep, slabp);