return if we're invertible for the fast scale+trans case when we have no inverse
matrix to return.
Review URL: https://codereview.appspot.com/7231063

git-svn-id: http://skia.googlecode.com/svn/trunk@7464 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
index 1987f3b..56292dc 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -378,8 +378,10 @@
     test_flatten(reporter, iden2);
 
     mat.setScale(0, SK_Scalar1);
+    REPORTER_ASSERT(reporter, !mat.invert(NULL));
     REPORTER_ASSERT(reporter, !mat.invert(&inverse));
     mat.setScale(SK_Scalar1, 0);
+    REPORTER_ASSERT(reporter, !mat.invert(NULL));
     REPORTER_ASSERT(reporter, !mat.invert(&inverse));
 
     // rectStaysRect test