mm/sl[au]b: use own bulk free function when bulk alloc failed

There is no benefit to call generic bulk free function when
kmem_cache_alloc_bulk() failed. Use own kmem_cache_free_bulk()
instead of generic function.

Note that if kmem_cache_alloc_bulk() fails to allocate first object in
SLUB, size is zero. So allow passing size == 0 to kmem_cache_free_bulk()
like SLAB's.

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

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