Fix removal of trailing slash for root dir

Author: mcarpenter

lib/net/sftp/operations/dir.rb

@@ -57,7 +57,7 @@ def entries(path)
     # it should be able to handle modest numbers of files in each directory.
     def glob(path, pattern, flags=0)
       flags |= ::File::FNM_PATHNAME
-      path = path.chop if path[-1,1] == "/"
+      path = path.chop if path.end_with?('/') && path != '/'
 
       results = [] unless block_given?
       queue = entries(path).reject { |e| e.name == "." || e.name == ".." }
@@ -90,4 +90,4 @@ def [](path, pattern)
     end
   end
 
-end; end; end
+end; end; end