Pull repo field up into base LazyGroup<>

Author: dahlbyk

LibGit2Sharp/Core/GitObjectLazyGroup.cs

@@ -5,12 +5,11 @@ namespace LibGit2Sharp.Core
 {
     internal class GitObjectLazyGroup : LazyGroup<GitObjectSafeHandle>
     {
-        private readonly Repository repo;
         private readonly ObjectId id;
 
         public GitObjectLazyGroup(Repository repo, ObjectId id)
+            : base(repo)
         {
-            this.repo = repo;
             this.id = id;
         }
 

LibGit2Sharp/Core/LazyGroup.cs

@@ -9,6 +9,12 @@ internal abstract class LazyGroup<T>
         private readonly IList<IEvaluator<T>> evaluators = new List<IEvaluator<T>>();
         private readonly object @lock = new object();
         private bool evaluated;
+        protected readonly Repository repo;
+
+        protected LazyGroup(Repository repo)
+        {
+            this.repo = repo;
+        }
 
         public ILazy<TResult> AddLazy<TResult>(Func<T, TResult> func)
         {