fix null check bugs found by µmix static analyzer

src/utils/win/SkDWriteFontFileStream.cpp

Index: src/utils/win/SkDWriteFontFileStream.cpp
diff --git a/src/utils/win/SkDWriteFontFileStream.cpp b/src/utils/win/SkDWriteFontFileStream.cpp
index 460f90e6c4aff8e6928eaebef5504d5e58a4490b..6c73441e72c2100f9151e9025e883c3d8611977c 100644
--- a/src/utils/win/SkDWriteFontFileStream.cpp
+++ b/src/utils/win/SkDWriteFontFileStream.cpp
@@ -139,7 +139,7 @@ HRESULT SkDWriteFontFileStreamWrapper::Create(SkStreamAsset* stream,
                                               SkDWriteFontFileStreamWrapper** streamFontFileStream)
 {
     *streamFontFileStream = new SkDWriteFontFileStreamWrapper(stream);
-    if (nullptr == streamFontFileStream) {
+    if (nullptr == *streamFontFileStream) {

[reed1, 2016/06/08 10:35:10]

We NEVER assume 'new' will return nullptr. Can we remove this check?

         return E_OUTOFMEMORY;
     }
     return S_OK;