pdo_dblib: Use stack local array instead of heap allocation (#18801)

Author: ndossche

ext/pdo_dblib/dblib_driver.c

@@ -233,9 +233,8 @@ zend_string *dblib_handle_last_id(pdo_dbh_t *dbh, const zend_string *name)
 	pdo_dblib_db_handle *H = (pdo_dblib_db_handle *)dbh->driver_data;
 
 	RETCODE ret;
-	char *id = NULL;
+	BYTE id[32];
 	size_t len;
-	zend_string *ret_id;
 
 	/*
 	 * Would use scope_identity() but it's not implemented on Sybase
@@ -267,13 +266,10 @@ zend_string *dblib_handle_last_id(pdo_dbh_t *dbh, const zend_string *name)
 		return NULL;
 	}
 
-	id = emalloc(32);
 	len = dbconvert(NULL, (dbcoltype(H->link, 1)) , (dbdata(H->link, 1)) , (dbdatlen(H->link, 1)), SQLCHAR, (BYTE *)id, (DBINT)-1);
 	dbcancel(H->link);
 
-	ret_id = zend_string_init(id, len, 0);
-	efree(id);
-	return ret_id;
+	return zend_string_init((const char *) id, len, 0);
 }
 
 static bool dblib_set_attr(pdo_dbh_t *dbh, zend_long attr, zval *val)