Fix bug #817757, "unaccessible directories displayed" submitted by

Anthon van der Neut using the fix that he suggested. This change
also seems to fix another bug, #509961

* lib/vclib/bincvs/__init__.py
  (_check_path):
    fix check of os.access() return value


git-svn-id: http://viewvc.tigris.org/svn/viewvc/trunk@766 8cb11bc2-c004-0410-86c3-e597b4017df7

lib/vclib/bincvs/__init__.py

@@ -518,7 +518,7 @@ else:
       # If the process running the web server is a member of
       # the group stat.ST_GID access may be granted.
       # so the fall back to os.access is needed to figure this out.
-      elif ((mode & mask) != mask) and (os.access(pathname,os.R_OK) == -1):
+      elif ((mode & mask) != mask) and (not os.access(pathname,os.R_OK)):
         valid = 0
 
       if isdir: