Don't leak fragment processor in SkColorFilter::asFragmentProcessors implementations.

src/effects/SkColorMatrixFilter.cpp

Index: src/effects/SkColorMatrixFilter.cpp
diff --git a/src/effects/SkColorMatrixFilter.cpp b/src/effects/SkColorMatrixFilter.cpp
index 6e9da61e1b79b7e620c2ae444c8e8492c6335e3f..894a7b089d378820fa81ec2cae3a01511f9ddf0b 100644
--- a/src/effects/SkColorMatrixFilter.cpp
+++ b/src/effects/SkColorMatrixFilter.cpp
@@ -562,6 +562,9 @@ bool SkColorMatrixFilter::asFragmentProcessors(GrContext*,
     if (frag) {
         if (array) {
             *array->append() = frag;
+        } else {
+            frag->unref();
+            SkDEBUGCODE(frag = NULL;)
         }
         return true;
     }