remove useless function

Signed-off-by: fbt <fbt@fleshless.org>

le-renew

@@ -16,22 +16,6 @@ set_default() {
 	fi
 }
 
-gen_san_string() {
-	declare d
-	declare -a argv
-
-	argv=( "$@" )
-
-	printf '[SAN]\nsubjectAltName='
-
-	for d in "${argv[@]}"; do
-		printf 'DNS:%s' "$d"
-		if ! [[ "$d" == "${argv[-1]}" ]]; then
-			printf ','
-		fi
-	done
-}
-
 main() {
 	declare cfg_dir
 	declare -a domains le_args