Fix pyre

Differential Revision: D66176243

Pull Request resolved: pytorch#6965

Author: kirklandsign

backends/arm/operators/op_add.py

@@ -82,6 +82,7 @@ def define_node(
 
         if needs_rescale:
             # Scale output back to 8 bit
+            # pyre-ignore
             tqutils.rescale_node_back_to_int8(node, add_output, scale, tosa_graph)