Test test_int8_ops_nnpi.py case typo fix. (pytorch#41008)

Summary:
Pull Request resolved: pytorch#41008

Test test_int8_ops_nnpi.py case typo fix.

Test Plan: test_int8_ops_nnpi.py case typo fix.

Reviewed By: hl475

Differential Revision: D22390331

fbshipit-source-id: 8d257c72114ce890720219eb519b9cb43b2ca49b

Author: venkatacrc

caffe2/contrib/fakelowp/test/test_int8_ops_nnpi.py

@@ -106,8 +106,8 @@ def test_int8_quantize(self, n, rand_seed):
                     "b": b_fp32,
                     "Y_fbgemm": Y_fbgemm,
                     "Y_glow": Y_glow,
-                    "diff": diff,
-                    "maxdiff": diff.max(axis=1),
+                    "diff": diff_Y,
+                    "maxdiff": diff_Y.max(axis=1),
                 },
             )
             assert 0
@@ -211,8 +211,8 @@ def test_int8_fc(
                     "b": b_fp32,
                     "Y_fbgemm": Y_fbgemm,
                     "Y_glow": Y_glow,
-                    "diff": diff,
-                    "maxdiff": diff.max(axis=1),
+                    "diff": diff_Y,
+                    "maxdiff": diff_Y.max(axis=1),
                 },
             )
             assert 0