fixed copy-paste bug (double-free)

src/charon/plugins/eap_sim/eap_sim.c

@@ -1050,7 +1050,6 @@ static bool is_mutual(private_eap_sim_t *this)
  */
 static void destroy(private_eap_sim_t *this)
 {
-	this->peer->destroy(this->peer);
 	this->peer->destroy(this->peer);
 	DESTROY_IF(this->hasher);
 	DESTROY_IF(this->prf);