K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2019-10-03T19:55:05.720868Z
K 7
svn:log
V 301
tmpfs_readdir(): unlock the locked node.

During readdir() we guarantee that the tn_dir.tn_parent does not go
away, but it might be replaced by a parallel rename.  Read tn_parent
only once, then use the cached value.

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END