kern/50608: udf fails the fs/vfs/t_vnops::create_many test

[pooka%iki.fi@localhost]

>Number:         50608
>Category:       kern
>Synopsis:       udf fails the fs/vfs/t_vnops::create_many test
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jan 02 12:10:00 +0000 2016
>Originator:     Antti Kantee
>Release:        
>Organization:
>Environment:
>Description:
Not clear what exactly is going on, but it seems like under some conditions udf unlink() returns ENOENT for a recently created file.
>How-To-Repeat:
run tests/fs/vfs/t_vnops::create_many for udf

https://releng.netbsd.org/b5reports/i386/build/2016.01.02.01.24.44/test.html#fs_vfs_t_vnops_udf_create_many
>Fix: