Fix naming of NHJoinClause

Author: hazzik

src/NHibernate/Linq/Visitors/QuerySourceIdentifier.cs

@@ -1,3 +1,4 @@
+using NHibernate.Linq.Clauses;
 using Remotion.Linq;
 using Remotion.Linq.Clauses;
 using Remotion.Linq.Clauses.ResultOperators;
@@ -52,6 +53,11 @@ public override void VisitJoinClause(JoinClause joinClause, QueryModel queryMode
 			_namer.Add(joinClause);
 		}
 
+		public override void VisitNhJoinClause(NhJoinClause joinClause, QueryModel queryModel, int index)
+		{
+			_namer.Add(joinClause);
+		}
+
 		public override void VisitResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, int index)
 		{
 			var groupBy = resultOperator as GroupResultOperator;