add option to write PDFs from gm
fix some compile warnings (reorder initializers, init local ptr)



git-svn-id: http://skia.googlecode.com/svn/trunk@642 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/pdf/SkPDFImage.cpp b/src/pdf/SkPDFImage.cpp
index 65b9b24..2162eae 100644
--- a/src/pdf/SkPDFImage.cpp
+++ b/src/pdf/SkPDFImage.cpp
@@ -29,7 +29,7 @@
 namespace {
 
 SkMemoryStream* extractImageData(const SkBitmap& bitmap) {
-    SkMemoryStream* result;
+    SkMemoryStream* result = NULL;
 
     bitmap.lockPixels();
     switch (bitmap.getConfig()) {