Fix -Wsign-compare warning (issued by clang++).

llvm-svn: 100799
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 5d3a6c3..01bd2e8 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -5552,7 +5552,7 @@
         InVec = InVec.getOperand(0);
       if (ISD::isNormalLoad(InVec.getNode())) {
         LN0 = cast<LoadSDNode>(InVec);
-        Elt = (Idx < (int)NumElems) ? Idx : Idx - NumElems;
+        Elt = (Idx < (int)NumElems) ? Idx : Idx - (int)NumElems;
       }
     }