ikev2: fix copy-paste error when freeing memory

Type: fix

Change-Id: If44c807d188b3e88d819f4132d73e6a34402a525
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>

Author: Filip Tehlar

src/plugins/ikev2/ikev2.c

@@ -318,7 +318,7 @@ ikev2_sa_free_all_vec (ikev2_sa_t * sa)
   vec_free (sa->r_id.data);
 
   vec_free (sa->i_auth.data);
-  if (sa->r_auth.key)
+  if (sa->i_auth.key)
     EVP_PKEY_free (sa->i_auth.key);
   vec_free (sa->r_auth.data);
   if (sa->r_auth.key)