fix license

connection_impl.go

@@ -476,7 +476,7 @@ func (c *connection) fill(need int) (err error) {
 		if err != nil {
 			break
 		}
-		if n < 0 {
+		if n == 0 {
 			// we must reuse bs that has been booked, otherwise will mess the input buffer
 			goto TryRead
 		}

net_io.go

@@ -1,3 +1,17 @@
+// Copyright 2023 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package netpoll
 
 import "syscall"