use existing info

Author: scivision

+stdlib/get_modtime.m

@@ -11,7 +11,7 @@
 end
 
 finf = dir(file);
-if isfolder(file)
+if finf.isdir
   % find which index of the struct array has member name == '.'
   i = find(strcmp({finf.name}, '.'), 1);
   finf = finf(i);