Fix the build on clang.

Signed-off-by: Edward Z. Yang <ezyang@fb.com>
diff --git a/tools/autograd/templates/Functions.cpp b/tools/autograd/templates/Functions.cpp
index 71fc176..a39aba8 100644
--- a/tools/autograd/templates/Functions.cpp
+++ b/tools/autograd/templates/Functions.cpp
@@ -265,7 +265,7 @@
 
 Tensor glu_double_backward_grad_output(const Tensor & grad, const Tensor & input, int64_t dim) {
   if (dim < 0) dim += input.dim();
-  auto sizes = std::vector<int64_t>{input.sizes()};
+  std::vector<int64_t> sizes = input.sizes();
   sizes[dim] /= 2;
   auto tmp = grad * glu_backward(input.type().ones(sizes), input, dim);
   return tmp.narrow(dim, 0, sizes[dim]) + tmp.narrow(dim, sizes[dim], sizes[dim]);