fix guards in transport_security_adapter.h

memory_usage.csv

@@ -1 +0,0 @@
-5678.136000,586484,4195801,5849.208667,205445,,

src/core/tsi/transport_security_adapter.h

@@ -59,4 +59,4 @@ tsi_handshaker *tsi_adapter_handshaker_get_wrapped(tsi_handshaker *adapter);
 }
 #endif
 
-#endif  // GRPC_CORE_TSI_TRANSPORT_SECURITY_ADAPTER_H
+#endif /* GRPC_CORE_TSI_TRANSPORT_SECURITY_ADAPTER_H */