Cleanup unused bit in ssl

Became unused when removing deprecated ssl_set_own_cert_xxx() functions
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index abe004c..fa20c7f 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -769,7 +769,6 @@
 {
     x509_crt *cert;                 /*!< cert                       */
     pk_context *key;                /*!< private key                */
-    int key_own_alloc;              /*!< did we allocate key?       */
     ssl_key_cert *next;             /*!< next key/cert pair         */
 };
 #endif /* POLARSSL_X509_CRT_PARSE_C */
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index e877315..fb943dc 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -6507,14 +6507,7 @@
     while( cur != NULL )
     {
         next = cur->next;
-
-        if( cur->key_own_alloc )
-        {
-            pk_free( cur->key );
-            polarssl_free( cur->key );
-        }
         polarssl_free( cur );
-
         cur = next;
     }
 }