* dir.cc (mkdir): Reorganize check for trailing dot to return correct error

when directory exists.
* fhandler_disk_file.cc (fhandler_disk_file::mkdir): Remove special test for
path ending in '.'.

winsup/cygwin/fhandler_disk_file.cc

@@ -1257,8 +1257,6 @@ fhandler_disk_file::mkdir (mode_t mode)
 #endif
       res = 0;
     }
-  else if (pc.exists ())
-    set_errno (EEXIST);
   else
     __seterrno ();