Fix valgrind reported issue, uninit mem in AutoReleaseGeometry::reset()

Review URL: http://codereview.appspot.com/4667048/




git-svn-id: http://skia.googlecode.com/svn/trunk@1761 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrDrawTarget.cpp b/gpu/src/GrDrawTarget.cpp
index 0f68872..1e8761f 100644
--- a/gpu/src/GrDrawTarget.cpp
+++ b/gpu/src/GrDrawTarget.cpp
@@ -965,5 +965,7 @@
         }
         fTarget = NULL;
     }
+    fVertices = NULL;
+    fIndices = NULL;
 }