Get rid of leaks in SkCodec::NewFromStream.

src/codec/SkCodec_libbmp.h

Index: src/codec/SkCodec_libbmp.h
diff --git a/src/codec/SkCodec_libbmp.h b/src/codec/SkCodec_libbmp.h
index 650259ad16cea6b8191097c6a80455768458defd..81b514e8f53621ddfb5162bbf1a783c04b767822 100644
--- a/src/codec/SkCodec_libbmp.h
+++ b/src/codec/SkCodec_libbmp.h
@@ -103,6 +103,7 @@ private:
      * Read enough of the stream to initialize the SkBmpCodec. Returns a bool
      * representing success or failure. If it returned true, and codecOut was
      * not NULL, it will be set to a new SkBmpCodec.
+     * Does *not* take ownership of the passed in SkStream.
      *
      */
     static bool ReadHeader(SkStream*, bool isIco, SkCodec** codecOut);