Remove bashism in gen-root-hints.sh script

scripts/gen-root-hints.sh

@@ -15,7 +15,7 @@ for atype in A AAAA; do
 	for n in a b c d e f g h i j k l m; do
 		ip="$(kdig "$atype" "$n.root-servers.net." +dnssec +short)"
 		ip_hex="$("$(dirname "$0")"/inet_pton.py "$ip")"
-		[ "$(echo -n "$ip_hex" | wc -c)" == "$alen" ] || exit 1
+		[ "$(echo -n "$ip_hex" | wc -c)" = "$alen" ] || exit 1
 		echo "#define HINT_${n}_${atype} \"$ip_hex\""
 	done
 done