Remove extraneous semicolon from mcrouter/lib/network/SecurityOptions…

….cpp

Summary:
Extraneous semicolons are a code smell and can mask more serious problems. `-Wextra-semi-stmt` finds them.

This diff removes an extraneous semicolon or adjusts a macro so that a semicolon is required after the macro (making it look like a standard function).

This file is drawn from a heavy-hitting list, so fixing this problem will allow *many* other files to take advantage of the safety `-Wextra-semi-stmt` offers.

This should be a low-risk diff: if it compiles, it works.

Reviewed By: meyering

Differential Revision: D51631138

fbshipit-source-id: 48112271dbb3054b3f3d60f5b81b28753a154f1b

mcrouter/lib/network/SecurityOptions.cpp

@@ -26,7 +26,7 @@ const char* securityMechToString(SecurityMech mech) {
       return "fizz";
     case SecurityMech::KTLS12:
       return "ktls12";
-  };
+  }
   folly::assume_unreachable();
 }