btr_node_status(): Do not segfault if btrn is NULL.

diff --git a/buffer_tree.c b/buffer_tree.c
index d12dcde7b5055b426f40ec116f0d5533213ef522..a7a3220b4d267955ae5fe467d9e08b1c48b6a5f3 100644 (file)
--- a/buffer_tree.c
+++ b/buffer_tree.c
@@ -753,6 +753,8 @@ int btr_node_status(struct btr_node *btrn, size_t min_iqs,
 {
        size_t iqs;
 
+       if (!btrn)
+               return 0;
        if (type != BTR_NT_LEAF) {
                if (btr_no_children(btrn))
                        return -E_BTR_NO_CHILD;