Remove unused cpp variable, breaking style checks (#2909)

Introduced recently in #2686

Author: andrewor14

torchao/csrc/cpu/scaled_embedding_bag.cpp

@@ -143,7 +143,6 @@ at::Tensor _scaled_embedding_bag_impl(const at::Tensor &qweight,
   int64_t emb_dim = qweight.size(1);
 
   auto index_type = indices.scalar_type();
-  auto qtype = qweight.scalar_type();
   float w_scale = w_scales.data_ptr<float>()[0];
 
   TORCH_CHECK(indices.is_contiguous() && offsets.is_contiguous(),
@@ -180,4 +179,4 @@ TORCH_LIBRARY_IMPL(torchao, CPU, m) {
   m.impl("torchao::_scaled_embedding_bag", &_scaled_embedding_bag_impl);
 }
 
-} // namespace torchao
+} // namespace torchao