ensure Cnf::FindFile doesn't return files below /dev/null

Very unlikely, but if the parent is /dev/null, the child empty and the
grandchild a value we returned /dev/null/value which doesn't exist, so
hardly a problem, but for best operability we should be consistent in
our work and return /dev/null always.

1 files changed, 2 insertions, 0 deletions

diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h
index f33f7804b..c13613171 100644
--- a/apt-pkg/contrib/fileutl.h
+++ b/apt-pkg/contrib/fileutl.h
@@ -234,6 +234,8 @@ std::string flCombine(std::string Dir,std::string File);
 /** \brief Takes a file path and returns the absolute path
  */
 std::string flAbsPath(std::string File);
+/** \brief removes superfluous /./ and // from path */
+APT_HIDDEN std::string flNormalize(std::string file);
 
 // simple c++ glob
 std::vector<std::string> Glob(std::string const &pattern, int flags=0);