create-lxc-config: refactor free_address

hooks/create-lxc-config

@@ -11,15 +11,10 @@ def try_env(key)
   ENV[key] or abort("enviroment variable '#{key}' not set")
 end
 
-def address_free?(assigned_subnets, address)
-  assigned_subnets.find { |s| s.contains?(address) || s == address }
-end
-
-def find_address(subnet, assigned_subsubnets)
+def find_address(subnet, assigned_subnets)
   subnet.enumerate(Limit: 1E4, Short: true)[1..1E4].each do |cidr|
-    unless address_free?(assigned_subsubnets, cidr)
-      return cidr
-    end
+    assigned = assigned_subnets.find { |s| s.contains?(cidr) || s == cidr }
+    return cidr unless assigned
   end
 end