[PATCH] slab: extract __kmem_cache_destroy from kmem_cache_destroy

The ability to free memory allocated to a slab cache is also useful if an
error occurs during setup of a slab.  So extract the function.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>