-Wuninitialized fixes

ipc/ipc_message_utils.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ipc/ipc_message_utils.h"
 
 #include "base/file_path.h"
 #include "base/json/json_writer.h"
 #include "base/nullable_string16.h"
 #include "base/scoped_ptr.h"
@@ skipping 437 matching lines @@
   WriteParam(m, p.routing_id);
   WriteParam(m, static_cast<int>(p.type));
   WriteParam(m, p.flags);
   WriteParam(m, p.sent);
   WriteParam(m, p.receive);
   WriteParam(m, p.dispatch);
   WriteParam(m, p.params);
 }
 
 bool ParamTraits<LogData>::Read(const Message* m, void** iter, param_type* r) {
-  int type;
+  int type = 0;  // clang pr9122
   bool result =
       ReadParam(m, iter, &r->channel) &&
       ReadParam(m, iter, &r->routing_id) &&
       ReadParam(m, iter, &type) &&
       ReadParam(m, iter, &r->flags) &&
       ReadParam(m, iter, &r->sent) &&
       ReadParam(m, iter, &r->receive) &&
       ReadParam(m, iter, &r->dispatch) &&
       ReadParam(m, iter, &r->params);
-  r->type = static_cast<uint16>(type);
+  if (result)  // real (but uninteresting) fix
+    r->type = static_cast<uint16>(type);
   return result;
 }
 
 }  // namespace IPC