SSL: fixed potential leak on memory allocation errors. If ngx_pool_cleanup_add() fails, we have to clean just created SSL context manually, thus appropriate call added. Additionally, ngx_pool_cleanup_add() moved closer to ngx_ssl_create() in the ngx_http_ssl_module, to make sure there are no leaks due to intermediate code.

--- a/src/mail/ngx_mail_ssl_module.c
+++ b/src/mail/ngx_mail_ssl_module.c
@@ -370,6 +370,7 @@ ngx_mail_ssl_merge_conf(ngx_conf_t *cf, 
 
     cln = ngx_pool_cleanup_add(cf->pool, 0);
     if (cln == NULL) {
+        ngx_ssl_cleanup_ctx(&conf->ssl);
         return NGX_CONF_ERROR;
     }