libext2fs: Potential null ptr deref in undo_err_handler_init

In the !undo_io_backing_manager case, undo_err_handler_init
will be passed a null data->real, which will be dereferenced.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed