close the inotify watcher when returning

might fix http://bugs.activestate.com/show_bug.cgi?id=95803#c12

tail.go

@@ -76,12 +76,10 @@ func (tail *Tail) reopen(wait bool) {
 		tail.file, err = os.Open(tail.Filename)
 		if err != nil {
 			if os.IsNotExist(err) && wait {
-				log.Println("blocking until exists")
 				err := tail.watcher.BlockUntilExists()
 				if err != nil {
 					panic(err)
 				}
-				log.Println("exists now")
 				continue
 			}
 			log.Println(fmt.Sprintf("Unable to reopen file (%s): %s", tail.Filename, err))

watch.go

@@ -36,7 +36,7 @@ func (fw *InotifyFileWatcher) BlockUntilExists() error {
 	}
 	<-w.Event
 	w.RemoveWatch(filepath.Dir(fw.Filename))
-	// XXX: how to free up w's goroutines without relying on the gc?
+	w.Close()
 	return nil
 }
 
@@ -63,6 +63,7 @@ func (fw *InotifyFileWatcher) ChangeEvents() chan bool {
 			case evt.IsRename():
 				close(ch)
 				w.RemoveWatch(fw.Filename)
+				w.Close()
 				return
 
 			case evt.IsModify():