zebra: Fix snmp walk of zebra rib

The snmp walk of the zebra rib was skipping entries
because in_addr_cmp was replaced with a prefix_cmp
which worked slightly differently causing parts
of the zebra rib tree to be skipped.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

zebra/zebra_snmp.c

@@ -253,9 +253,11 @@ static void check_replace(struct route_node *np2, struct route_entry *re2,
 		return;
 	}
 
-	if (prefix_cmp(&(*np)->p, &np2->p) < 0)
+	if (in_addr_cmp((uint8_t *)&(*np)->p.u.prefix4,
+			(uint8_t *)&np2->p.u.prefix4) < 0)
 		return;
-	if (prefix_cmp(&(*np)->p, &np2->p) > 0) {
+	if (in_addr_cmp((uint8_t *)&(*np)->p.u.prefix4,
+			(uint8_t *)&np2->p.u.prefix4) > 0) {
 		*np = np2;
 		*re = re2;
 		return;