When shifting 1 << level into a 64bit value use 1ULL so the shift happens
on a 64bit value. I doubt we'll see tables with more than 31 levels but
lets be correct.

Fix for CID 492339, CID 492340, CID 492357, CID 492363
-- 
:wq Claudio

Index: chash.c
===================================================================
RCS file: /cvs/src/usr.sbin/bgpd/chash.c,v
diff -u -p -r1.3 chash.c
--- chash.c	3 Nov 2025 13:48:19 -0000	1.3
+++ chash.c	4 Nov 2025 12:48:14 -0000
@@ -517,8 +517,8 @@ ch_table_resize(struct ch_table *t)
 {
 	struct ch_group **tables;
 	struct ch_meta **metas;
-	uint64_t oldsize = 1 << t->ch_level;
-	uint64_t newsize = 1 << (t->ch_level + 1);
+	uint64_t oldsize = 1ULL << t->ch_level;
+	uint64_t newsize = 1ULL << (t->ch_level + 1);
 	int64_t idx;
 
 	if (t->ch_level + 1 >= CH_H1_BITS) {
@@ -566,7 +566,7 @@ ch_table_fill(struct ch_table *t, uint64
 	uint64_t cnt, i;
 
 	idx <<= (t->ch_level - meta->cs_local_level);
-	cnt = 1 << (t->ch_level - meta->cs_local_level);
+	cnt = 1ULL << (t->ch_level - meta->cs_local_level);
 
 	for (i = 0; i < cnt; i++) {
 		t->ch_tables[idx + i] = table;
@@ -722,7 +722,7 @@ _ch_init(const struct ch_type *type, str
 void
 _ch_destroy(const struct ch_type *type, struct ch_table *t)
 {
-	uint64_t idx, max = 1 << t->ch_level;
+	uint64_t idx, max = 1ULL << t->ch_level;
 	struct ch_group *table = NULL;
 
 	for (idx = 0; idx < max; idx++) {
@@ -859,7 +859,7 @@ _ch_next(const struct ch_type *type, str
 	if (t->ch_tables == NULL)
 		return NULL;
 
-	max = 1 << t->ch_level;
+	max = 1ULL << t->ch_level;
 	idx = it->ci_ext_idx;
 	if (idx >= max)
 		return NULL;