[windows_kext] fix all linter error

windows_kext/kextinterface/kext_file_test.go

@@ -0,0 +1,12 @@
+//go:build linux
+// +build linux
+
+package kextinterface
+
+type KextFile struct{}
+
+func (f *KextFile) Read(buffer []byte) (int, error) {
+	return 0, nil
+}
+
+// func (f *KextFile) flushBuffer() {}