inotify: server: remove wpath method

Only called once. And can be simplified to an easy oneliner.

hgext/inotify/server.py

@@ -288,14 +288,6 b' class repowatcher(pollable):'
         self.add_watch(self.repo.path, inotify.IN_DELETE)
         self.check_dirstate()
 
-    def wpath(self, evt):
-        path = evt.fullpath
-        if path == self.repo.root:
-            return ''
-        if path.startswith(self.wprefix):
-            return path[len(self.wprefix):]
-        raise 'wtf? ' + path
-
     def dir(self, tree, path):
         if path:
             for name in path.split('/'):
@@ -585,7 +577,9 b' class repowatcher(pollable):'
             self.ui.note(_('%s reading %d events\n') %
                          (self.event_time(), len(events)))
         for evt in events:
-            wpath = self.wpath(evt)
+            assert evt.fullpath.startswith(self.wprefix)
+            wpath = evt.fullpath[len(self.wprefix):]
+
             if evt.mask & inotify.IN_UNMOUNT:
                 self.process_unmount(wpath, evt)
             elif evt.mask & (inotify.IN_MODIFY | inotify.IN_ATTRIB):