don't leak filters



git-svn-id: http://skia.googlecode.com/svn/trunk@4358 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/imagefiltersbase.cpp b/gm/imagefiltersbase.cpp
index 130ba5b..b17ba75 100644
--- a/gm/imagefiltersbase.cpp
+++ b/gm/imagefiltersbase.cpp
@@ -202,6 +202,10 @@
             canvas->restore();
             canvas->translate(DX, 0);
         }
+        
+        for(size_t j = 0; j < SK_ARRAY_COUNT(filters); ++j) {
+            SkSafeUnref(filters[j]);
+        }
     }
 
 private: