Fix null pointer dereference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84806 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 8bd0370..37736c0 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4601,7 +4601,7 @@
       N->InitOperands(new SDUse[NumOps], Ops, NumOps);
       N->OperandsNeedDelete = true;
     } else
-      MN->InitOperands(MN->OperandList, Ops, NumOps);
+      N->InitOperands(N->OperandList, Ops, NumOps);
   }
 
   // Delete any nodes that are still dead after adding the uses for the