cleaning up mono warnings.

Author: craiggwilson

src/MongoDB.Driver.Tests/FindFluentTests.cs

@@ -34,7 +34,7 @@ public void CountAsync_should_not_throw_a_null_reference_exception()
         {
             var subject = CreateSubject();
 
-            var result = subject.CountAsync().GetAwaiter().GetResult();
+            subject.CountAsync().GetAwaiter().GetResult();
 
             _collection.Received().CountAsync(
                 subject.Filter,

src/MongoDB.Driver/Linq/Processors/MethodCallBinders/AnyBinder.cs

@@ -63,7 +63,6 @@ public override Expression Bind(ProjectionExpression projection, ProjectionBindi
 
         private LambdaExpression CreateSyncAggregator()
         {
-            var sourceType = typeof(IEnumerable<int>);
             var sourceParameter = Expression.Parameter(typeof(IEnumerable<int>), "source");
             return Expression.Lambda(
                 Expression.Call(
@@ -76,7 +75,6 @@ private LambdaExpression CreateSyncAggregator()
 
         private static LambdaExpression CreateAsyncAggregator()
         {
-            var sourceType = typeof(IAsyncCursor<int>);
             var sourceParameter = Expression.Parameter(typeof(Task<IAsyncCursor<int>>), "source");
             var cancellationTokenParameter = Expression.Parameter(typeof(CancellationToken), "ct");
             return Expression.Lambda(

src/MongoDB.Driver/Linq/Processors/MethodCallBinders/ImmediateResultBinderBase.cs

@@ -38,7 +38,6 @@ private static LambdaExpression CreateSyncAggregator(string aggregatorName, Type
         {
             var sourceType = typeof(IEnumerable<>).MakeGenericType(returnType);
             var sourceParameter = Expression.Parameter(sourceType, "source");
-            var cancellationTokenParameter = Expression.Parameter(typeof(CancellationToken), "ct");
             return Expression.Lambda(
                 Expression.Call(typeof(Enumerable),
                     aggregatorName,