Ensure ticker cleanup in watch functions

clipboard_android.go

@@ -81,6 +81,7 @@ func watch(ctx context.Context, t Format) <-chan []byte {
 	ti := time.NewTicker(time.Second)
 	last := Read(t)
 	go func() {
+		defer ti.Stop()
 		for {
 			select {
 			case <-ctx.Done():

clipboard_darwin.go

@@ -100,6 +100,7 @@ func watch(ctx context.Context, t Format) <-chan []byte {
 	ti := time.NewTicker(time.Second)
 	lastCount := C.long(C.clipboard_change_count())
 	go func() {
+		defer ti.Stop()
 		for {
 			select {
 			case <-ctx.Done():

clipboard_ios.go

@@ -59,6 +59,7 @@ func watch(ctx context.Context, t Format) <-chan []byte {
 	ti := time.NewTicker(time.Second)
 	last := Read(t)
 	go func() {
+		defer ti.Stop()
 		for {
 			select {
 			case <-ctx.Done():

clipboard_linux.go

@@ -138,6 +138,7 @@ func watch(ctx context.Context, t Format) <-chan []byte {
 	ti := time.NewTicker(time.Second)
 	last := Read(t)
 	go func() {
+		defer ti.Stop()
 		for {
 			select {
 			case <-ctx.Done():

clipboard_windows.go

@@ -404,6 +404,7 @@ func watch(ctx context.Context, t Format) <-chan []byte {
 	go func() {
 		// not sure if we are too slow or the user too fast :)
 		ti := time.NewTicker(time.Second)
+		defer ti.Stop()
 		cnt, _, _ := getClipboardSequenceNumber.Call()
 		ready <- struct{}{}
 		for {