Revert "make fsnotify event more readable"

[ upstream commit d86c148 ]

This reverts commit 479fb7d.

The code changes are not equivalent. For example,
event.Op=fsnotify.Create has different results.

Fixes: #22903

Signed-off-by: Zhichuan Liang <gray.liang@isovalent.com>
Signed-off-by: Fabio Falzoi <fabio.falzoi@isovalent.com>

pkg/datapath/linux/ipsec/ipsec_linux.go

@@ -917,7 +917,7 @@ func keyfileWatcher(ctx context.Context, watcher *fswatcher.Watcher, keyfilePath
 	for {
 		select {
 		case event := <-watcher.Events:
-			if !event.Op.Has(fsnotify.Create) || !event.Op.Has(fsnotify.Write) {
+			if event.Op&(fsnotify.Create|fsnotify.Write) == 0 {
 				continue
 			}