scoutfs: clean up forest lock data

The client lock code forgot to call into the forest to clear its
per-lock tracking before freeing the lock.  This would result in a slow
memory leak over time as locks were reclaimed by memory pressure.  It
shouldn't have affected consistency.

Signed-off-by: Zach Brown <zab@versity.com>

kmod/src/lock.c

@@ -222,6 +222,7 @@ static void lock_free(struct lock_info *linfo, struct scoutfs_lock *lock)
 	BUG_ON(!list_empty(&lock->lru_head));
 	BUG_ON(!list_empty(&lock->cov_list));
 
+	scoutfs_forest_clear_lock(sb, lock);
 	kfree(lock);
 }