Fixes for re-enabling more MSVC level 4 warnings: ppapi/ edition

ppapi/cpp/dev/buffer_dev.cc

Index: ppapi/cpp/dev/buffer_dev.cc
diff --git a/ppapi/cpp/dev/buffer_dev.cc b/ppapi/cpp/dev/buffer_dev.cc
index aca7b1b795fbe3b13d5049092be2eddee858ead0..5435afdceceb3cfbaa53b3cf25abd5eb30565052 100644
--- a/ppapi/cpp/dev/buffer_dev.cc
+++ b/ppapi/cpp/dev/buffer_dev.cc
@@ -59,11 +59,13 @@ Buffer_Dev& Buffer_Dev::operator=(const Buffer_Dev& rhs) {
 }
 
 void Buffer_Dev::Init() {
-  if (!get_interface<PPB_Buffer_Dev>()->Describe(pp_resource(), &size_) ||
-      !(data_ = get_interface<PPB_Buffer_Dev>()->Map(pp_resource()))) {
-    data_ = NULL;
-    size_ = 0;
+  if (get_interface<PPB_Buffer_Dev>()->Describe(pp_resource(), &size_)) {
+    data_ = get_interface<PPB_Buffer_Dev>()->Map(pp_resource());
+    if (data_)
+      return;
   }
+  data_ = NULL;
+  size_ = 0;
 }
 
 }  // namespace pp