[PATCH 5/5] cbtree.h: define cb_init() in terms of CBTREE_INIT

[Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>]

Use the same pattern for cb_init() as the one established in the
recent refactoring of other such patterns in
5726a6b4012 (*.c *_init(): define in terms of corresponding *_INIT
macro, 2021-07-01).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 cbtree.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/cbtree.h b/cbtree.h
index a04a312c3f5..dedbb8e2a45 100644
--- a/cbtree.h
+++ b/cbtree.h
@@ -37,11 +37,12 @@ enum cb_next {
 	CB_BREAK = 1
 };
 
-#define CBTREE_INIT { .root = NULL }
+#define CBTREE_INIT { 0 }
 
 static inline void cb_init(struct cb_tree *t)
 {
-	t->root = NULL;
+	struct cb_tree blank = CBTREE_INIT;
+	memcpy(t, &blank, sizeof(*t));
 }
 
 struct cb_node *cb_lookup(struct cb_tree *, const uint8_t *k, size_t klen);
-- 
2.33.0.1294.g2bdf2798764