hgweb: drop the default argument for get_stat

This default argument is used twice and is making things confusing. Making it
explicit helps to clarify coming changesets

mercurial/hgweb/common.py

@@ -112,8 +112,8 b' def _statusmessage(code):'
 def statusmessage(code, message=None):
     return '%d %s' % (code, message or _statusmessage(code))
 
-def get_stat(spath, fn="00changelog.i"):
-    """stat fn (00changelog.i by default) if it exists, spath otherwise"""
+def get_stat(spath, fn):
+    """stat fn if it exists, spath otherwise"""
     cl_path = os.path.join(spath, fn)
     if os.path.exists(cl_path):
         return os.stat(cl_path)
@@ -121,7 +121,7 b' def get_stat(spath, fn="00changelog.i"):'
         return os.stat(spath)
 
 def get_mtime(spath):
-    return get_stat(spath).st_mtime
+    return get_stat(spath, "00changelog.i").st_mtime
 
 def staticfile(directory, fname, req):
     """return a file inside directory with guessed Content-Type header

mercurial/hgweb/hgweb_mod.py

@@ -120,7 +120,7 b' class hgweb(object):'
             return repo.filtered('served')
 
     def refresh(self, request=None):
-        st = get_stat(self.repo.spath)
+        st = get_stat(self.repo.spath, '00changelog.i')
         pst = get_stat(self.repo.spath, 'phaseroots')
         # changelog mtime and size, phaseroots mtime and size
         repostate = ((st.st_mtime, st.st_size), (pst.st_mtime, pst.st_size))