Fix typo in reduce_util.h from my #9144

[swolchok]

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[swolchok]

Stack from ghstack (oldest at bottom):

• -> Fix typo in reduce_util.h from my #9144 #12720

[pytorch-bot]

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⏳ 36 Pending, 1 Unrelated Failure

As of commit f596553 with merge base 6c74651 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

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