SLUB: It is legit to allocate a slab of the maximum permitted size

Sorry I screwed up the comparison. It is only an error if we attempt
to allocate a slab larger than the maximum allowed size.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>