tree 21d8d0741a5ae4676fea5b53939cc806ae2b41bd
parent 91adb56473febeeb3ef657bb5147ddd355465700
author NeilBrown <neilb@suse.de> 1238470779 +1100
committer NeilBrown <neilb@suse.de> 1238470779 +1100

md: md_unregister_thread should cope with being passed NULL

Mostly md_unregister_thread is only called when we know that the
thread is NULL, but sometimes we need to check first.  It is safer
to put the check inside md_unregister_thread itself.

Signed-off-by: NeilBrown <neilb@suse.de>