objpool: fix the overestimation of object pooling metadata size

objpool: fix the overestimation of object pooling metadata size

objpool uses struct objpool_head to store metadata information, and its
cpu_slots member points to an array of pointers that store the addresses
of the percpu ring arrays.  However, the memory size allocated during the
initialization of cpu_slots is nr_cpu_ids * sizeof(struct objpool_slot).
On a 64-bit machine, the size of struct objpool_slot is 16 bytes, which is
twice the size of the actual pointer required, and the extra memory is
never be used, resulting in a waste of memory.  Therefore, the memory size
required for cpu_slots needs to be corrected.

Link: https://lkml.kernel.org/r/20260202132846.68257-1-zhouwenhao7600@gmail.com
Fixes: b4edb8d2d464 ("lib: objpool added: ring-array based lockless MPMC")
Signed-off-by: zhouwenhao <zhouwenhao7600@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Matt Wu <wuqiang.matt@bytedance.com>
Cc: wuqiang.matt <wuqiang.matt@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>