fix: tls conn nil pointer

terasu.go

@@ -7,7 +7,6 @@ import (
 
 // Use terasu in this TLS conn
 func Use(conn *tls.Conn) *tls.Conn {
-	trsConn := (*trsconn)(unsafe.Pointer(conn))
-	trsConn.handshakeFn = trsConn.clientHandshake
-	return (*tls.Conn)(unsafe.Pointer(trsConn))
+	(*_trsconn)(unsafe.Pointer(conn)).handshakeFn = (*trsconn)(conn).clientHandshake
+	return conn
 }