Start the refcount at 1

Author: sodabrew

ext/mysql2/statement.c

@@ -109,7 +109,7 @@ VALUE rb_mysql_stmt_new(VALUE rb_client, VALUE sql) {
   rb_stmt = Data_Make_Struct(cMysql2Statement, mysql_stmt_wrapper, rb_mysql_stmt_mark, rb_mysql_stmt_free, stmt_wrapper);
   {
     stmt_wrapper->client = rb_client;
-    stmt_wrapper->refcount = 0;
+    stmt_wrapper->refcount = 1;
     stmt_wrapper->stmt = NULL;
   }