group closeSent with writeFrameMu

Author: mafredri

conn.go

@@ -68,15 +68,15 @@ type Conn struct {
 	writeBuf       []byte
 	writeHeaderBuf [8]byte
 	writeHeader    header
+	closeSent      bool
 
 	closeReadMu   sync.Mutex
 	closeReadCtx  context.Context
 	closeReadDone chan struct{}
 
-	closed    chan struct{}
-	closeMu   sync.Mutex
-	closing   bool
-	closeSent bool
+	closed  chan struct{}
+	closeMu sync.Mutex
+	closing bool
 
 	pingCounter   atomic.Int64
 	activePingsMu sync.Mutex