Fix CloseNotifyConn.Close function (#5022)

The CloseNotifyConn.Close() function calls itself if the closeFlag is equal to 0 which would mean it would immediately swap the closeFlag value to 1 and never call closeFn.  It is unclear what the intent of this call to cc.Close() was but I assume it was meant to be a call to close the Conn object instead.

README.md

@@ -13,13 +13,15 @@ frp is an open source project with its ongoing development made possible entirel
 
 <h3 align="center">Gold Sponsors</h3>
 <!--gold sponsors start-->
-<p align="center">
+<div align="center">
-  <a href="https://www.recall.ai/?utm_source=github&utm_medium=sponsorship&utm_campaign=fatedier-frp" target="_blank">
+
-    <b>Recall.ai - API for meeting recordings</b><br>
+## Recall.ai - API for meeting recordings
-    <br>
+
-    <sup>If you're looking for a meeting recording API, consider checking out Recall.ai, an API that records Zoom, Google Meet, Microsoft Teams, in-person meetings, and more.</sup>
+If you're looking for a meeting recording API, consider checking out [Recall.ai](https://www.recall.ai/?utm_source=github&utm_medium=sponsorship&utm_campaign=fatedier-frp),
-  </a>
+
-</p>
+an API that records Zoom, Google Meet, Microsoft Teams, in-person meetings, and more.
+
+</div>
 <p align="center">
   <a href="https://go.warp.dev/frp" target="_blank">
     <img width="360px" src="https://raw.githubusercontent.com/warpdotdev/brand-assets/refs/heads/main/Github/Sponsor/Warp-Github-LG-01.png">

README_zh.md

@@ -15,13 +15,15 @@ frp 是一个完全开源的项目，我们的开发工作完全依靠赞助者
 
 <h3 align="center">Gold Sponsors</h3>
 <!--gold sponsors start-->
-<p align="center">
+<div align="center">
-  <a href="https://www.recall.ai/?utm_source=github&utm_medium=sponsorship&utm_campaign=fatedier-frp" target="_blank">
+
-    <b>Recall.ai - API for meeting recordings</b><br>
+## Recall.ai - API for meeting recordings
-    <br>
+
-    <sup>If you're looking for a meeting recording API, consider checking out Recall.ai, an API that records Zoom, Google Meet, Microsoft Teams, in-person meetings, and more.</sup>
+If you're looking for a meeting recording API, consider checking out [Recall.ai](https://www.recall.ai/?utm_source=github&utm_medium=sponsorship&utm_campaign=fatedier-frp),
-  </a>
+
-</p>
+an API that records Zoom, Google Meet, Microsoft Teams, in-person meetings, and more.
+
+</div>
 <p align="center">
   <a href="https://go.warp.dev/frp" target="_blank">
     <img width="360px" src="https://raw.githubusercontent.com/warpdotdev/brand-assets/refs/heads/main/Github/Sponsor/Warp-Github-LG-01.png">

pkg/util/net/conn.go

@@ -149,7 +149,7 @@ func WrapCloseNotifyConn(c net.Conn, closeFn func()) net.Conn {
 func (cc *CloseNotifyConn) Close() (err error) {
 	pflag := atomic.SwapInt32(&cc.closeFlag, 1)
 	if pflag == 0 {
-		err = cc.Close()
+		err = cc.Conn.Close()
 		if cc.closeFn != nil {
 			cc.closeFn()
 		}