Fix a typo Duncan noticed.

llvm-svn: 97735
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6264968..023e486 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4871,7 +4871,7 @@
 
 namespace {
 
-/// RAUWUpdateListner - Helper for ReplaceAllUsesWith - When the node
+/// RAUWUpdateListener - Helper for ReplaceAllUsesWith - When the node
 /// pointed to by a use iterator is deleted, increment the use iterator
 /// so that it doesn't dangle.
 ///