cleanup 'repository_path' implementation

ee/app/models/geo/project_registry.rb

@@ -60,17 +60,6 @@ class Geo::ProjectRegistry < Geo::BaseRegistry
     project.wiki_enabled? && (never_synced_wiki? || wiki_sync_needed?(scheduled_time))
   end
 
-  def repository_path(type)
-    repo_path = project.disk_path
-
-    case type
-    when :repository
-      repo_path
-    when :wiki
-      "#{repo_path}.wiki"
-    end
-  end
-
   private
 
   def never_synced_repository?

ee/app/services/geo/repository_verify_secondary_service.rb

@@ -73,7 +73,12 @@ module Geo
     end
 
     def repository_path
-      registry.repository_path(type)
+      case type
+      when :repository
+        registry.project.disk_path
+      when :wiki
+        registry.project.wiki.disk_path
+      end
     end
 
     def path_to_repo

ee/spec/services/geo/repository_verify_secondary_service_spec.rb

@@ -12,7 +12,7 @@ describe Geo::RepositoryVerifySecondaryService, :geo do
   shared_examples 'verify checksums for repositories/wikis' do |type|
     let(:checksum) { instance_double('Gitlab::Git::Checksum') }
     let(:storage) { project.repository_storage }
-    let(:relative_path) { registry.repository_path(type) }
+    let(:relative_path) { service.send(:repository_path) }
 
     subject(:service)  { described_class.new(registry, type) }