set statment to NULL. Fixes #1983

diff --git a/src/modules/rlm_sql/drivers/rlm_sql_iodbc/rlm_sql_iodbc.c b/src/modules/rlm_sql/drivers/rlm_sql_iodbc/rlm_sql_iodbc.c
index 4a4ae5c..c15664c 100644 (file)
--- a/src/modules/rlm_sql/drivers/rlm_sql_iodbc/rlm_sql_iodbc.c
+++ b/src/modules/rlm_sql/drivers/rlm_sql_iodbc/rlm_sql_iodbc.c
@@ -259,6 +259,7 @@ static sql_rcode_t sql_free_result(rlm_sql_handle_t *handle, rlm_sql_config_t *c
        conn->row = NULL;
 
        SQLFreeStmt(conn->stmt, SQL_DROP);
+       conn->stmt = NULL;
 
        return 0;
 }