Exhaust the cases.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130043 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaCXXCast.cpp b/lib/Sema/SemaCXXCast.cpp
index 743fdd2..648011b 100644
--- a/lib/Sema/SemaCXXCast.cpp
+++ b/lib/Sema/SemaCXXCast.cpp
@@ -1329,7 +1329,8 @@
 
     const char *inappropriate = 0;
     switch (SrcExpr.get()->getObjectKind()) {
-    default: break;
+    case OK_Ordinary:
+      break;
     case OK_BitField:        inappropriate = "bit-field";           break;
     case OK_VectorComponent: inappropriate = "vector element";      break;
     case OK_ObjCProperty:    inappropriate = "property expression"; break;