Remove unused-but-set variables in telephoto/execution/Execution.cpp +5

Summary:
This diff removes a variable that was set, but which was not used.

LLVM-15 has a warning `-Wunused-but-set-variable` which we treat as an error because it's so often diagnostic of a code issue. Unused but set variables often indicate a programming mistake, but can also just be unnecessary cruft that harms readability and performance.

Removing this variable will not change how your code works, but the unused variable may indicate your code isn't working the way you thought it was. If you feel the diff needs changes before landing, **please commandeer** and make appropriate changes: there are hundreds of these and responding to them individually is challenging.

For questions/comments, contact r-barnes.

 - If you approve of this diff, please use the "Accept & Ship" button :-)

Reviewed By: dtolnay

Differential Revision: D79967971

fbshipit-source-id: 6e227b82a174f32b36d614c2c54fc87a9fd9418f

Author: r-barnes

third-party/thrift/src/thrift/conformance/cpp2/AnyRefTest.cpp

@@ -39,9 +39,9 @@ TEST(AnyRefTest, DocExample1) {
 
 TEST(AnyRefTest, DocExample2) {
   auto foo = [](any_ref in) {
-    if (const auto* i = any_cast<const int>(&in)) {
+    if (any_cast<const int>(&in)) {
       return 1;
-    } else if (const auto* f = any_cast<const float>(&in)) {
+    } else if (any_cast<const float>(&in)) {
       return 2;
     }
     return 3;