fix cloned string cleanup

dynamodb/update.odin

@@ -930,7 +930,7 @@ parse_update_expression_string :: proc(request_body: []byte) -> (expr: string, o
 		return
 	}
 
-	expr = string(ue_str)
+	expr = strings.clone(string(ue_str))
 	ok = true
 	return
 }
@@ -939,24 +939,24 @@ parse_update_expression_string :: proc(request_body: []byte) -> (expr: string, o
 parse_return_values :: proc(request_body: []byte) -> string {
 	data, parse_err := json.parse(request_body, allocator = context.temp_allocator)
 	if parse_err != nil {
-		return "NONE"
+		return strings.clone("NONE")
 	}
 	defer json.destroy_value(data)
 
 	root, root_ok := data.(json.Object)
 	if !root_ok {
-		return "NONE"
+		return strings.clone("NONE")
 	}
 
 	rv_val, found := root["ReturnValues"]
 	if !found {
-		return "NONE"
+		return strings.clone("NONE")
 	}
 
 	rv_str, str_ok := rv_val.(json.String)
 	if !str_ok {
-		return "NONE"
+		return strings.clone("NONE")
 	}
 
-	return string(rv_str)
+	return strings.clone(string(rv_str))
 }