Fix typo
Fix typo

Summary: Closes https://github.com/caffe2/caffe2/pull/1596

Reviewed By: zdevito

Differential Revision: D6528030

Pulled By: jamesr66a

fbshipit-source-id: feedf272cd6583360e5e20e90de3f02b728566e6

caffe2/caffe2,xzturn/caffe2,xzturn/caffe2,xzturn/caffe2,xzturn/caffe2,xzturn/caffe2,Yangqing/caffe2,Yangqing/caffe2,Yangqing/caffe2,Yangqing/caffe2,Yangqing/caffe2