bundlerepo: remove unused 'repo' parameter

Revision 7c231754a621 (filelog: add file function to open other
filelogs, 2011-05-10) added a _file() method to revlog, which also
required a 'repo' parameter to be added to bundlefilelog's
constructor. The _file() method was then removed in b95a5bb58653
(filelog: remove unused _file method, 2015-01-22), which made the
constructor parameter unused, so let's remove that too.

mercurial/bundlerepo.py

@@ -177,11 +177,10 b' class bundlemanifest(bundlerevlog, manif'
         return manifest.manifest.revision(self, nodeorrev)
 
 class bundlefilelog(bundlerevlog, filelog.filelog):
-    def __init__(self, opener, path, bundle, linkmapper, repo):
+    def __init__(self, opener, path, bundle, linkmapper):
         filelog.filelog.__init__(self, opener, path)
         bundlerevlog.__init__(self, opener, self.indexfile, bundle,
                               linkmapper)
-        self._repo = repo
 
     def baserevision(self, nodeorrev):
         return filelog.filelog.revision(self, nodeorrev)
@@ -322,8 +321,7 b' class bundlerepository(localrepo.localre'
 
         if f in self.bundlefilespos:
             self.bundle.seek(self.bundlefilespos[f])
-            return bundlefilelog(self.svfs, f, self.bundle,
-                                 self.changelog.rev, self)
+            return bundlefilelog(self.svfs, f, self.bundle, self.changelog.rev)
         else:
             return filelog.filelog(self.svfs, f)