dlm: fix shutdown cleanup

Fixes a regression from commit 0f8e0d9a317406612700426fad3efab0b7bbc467,
"dlm: allow multiple lockspace creates".

An extraneous 'else' slipped into a code fragment being moved from
release_lockspace() to dlm_release_lockspace(). The result of the
unwanted 'else' is that dlm threads and structures are not stopped
and cleaned up when the final dlm lockspace is removed. Trying to
create a new lockspace again afterward will fail with
"kmem_cache_create: duplicate cache dlm_conn" because the cache
was not previously destroyed.

Signed-off-by: David Teigland <[e-mail]>

fs/dlm/lockspace.c

···
 	error = release_lockspace(ls, force);
 	if (!error)
 		ls_count--;
-	else if (!ls_count)
+	if (!ls_count)
 		threads_stop();
 	mutex_unlock(&ls_lock);