fixed rubocop offenses

app/validators/host_validator.rb

@@ -16,7 +16,7 @@ class HostValidator < ActiveModel::EachValidator
 
   def valid_host?(value)
     URI.parse("http://#{value}").host == value
-  rescue URI::InvalidURIError => e
+  rescue URI::InvalidURIError
     false
   end
 end

lib/gitlab/geo.rb

@@ -18,7 +18,7 @@ module Gitlab
       self.enabled? && !self.current_node.primary?
     end
 
-    def self.geo_node?(host: host, port: port)
+    def self.geo_node?(host:, port:)
       GeoNode.where(host: host, port: port).exists?
     end
   end