SSL: fix memory leak

In OOM situation. Follow-up fix to commit a9cd4f4e.

lib/sslgen.c

@@ -350,8 +350,11 @@ CURLcode Curl_ssl_addsessionid(struct connectdata *conn,
   store->name = clone_host;               /* clone host name */
   store->remote_port = conn->remote_port; /* port number */
 
-  if(!Curl_clone_ssl_config(&conn->ssl_config, &store->ssl_config))
+  if(!Curl_clone_ssl_config(&conn->ssl_config, &store->ssl_config)) {
+    store->sessionid = NULL; /* let caller free sessionid */
+    free(clone_host);
     return CURLE_OUT_OF_MEMORY;
+  }
 
   return CURLE_OK;
 }