getFactory() must return a factory.

src/core/SkWriteBuffer.cpp

Index: src/core/SkWriteBuffer.cpp
diff --git a/src/core/SkWriteBuffer.cpp b/src/core/SkWriteBuffer.cpp
index 450c30ed5cdeeabe3628f3d5e0154462fd4beee2..cca7d8170ac52684b94ae4bf846fe43419bb03c5 100644
--- a/src/core/SkWriteBuffer.cpp
+++ b/src/core/SkWriteBuffer.cpp
@@ -270,15 +270,9 @@ void SkWriteBuffer::writeFlattenable(const SkFlattenable* flattenable) {
      *  The distinction is important, since 0-index is 32bits (always), but a
      *  0-functionptr might be 32 or 64 bits.
      */
-
-    SkFlattenable::Factory factory = NULL;
-    if (flattenable) {
-        factory = flattenable->getFactory();
-    }
-    if (NULL == factory) {
+    if (NULL == flattenable) {
         if (this->isValidating()) {
             this->writeString("");
-            SkASSERT(NULL == flattenable); // We shouldn't get in here in this scenario
         } else if (fFactorySet != NULL || fNamedFactorySet != NULL) {
             this->write32(0);
         } else {
@@ -287,6 +281,9 @@ void SkWriteBuffer::writeFlattenable(const SkFlattenable* flattenable) {
         return;
     }
 
+    SkFlattenable::Factory factory = flattenable->getFactory();
+    SkASSERT(factory != NULL);
+
     /*
      *  We can write 1 of 3 versions of the flattenable:
      *  1.  function-ptr : this is the fastest for the reader, but assumes that