Fix import ordering presubmit test (#4422)

Automatically submitted.

test/presubmit_test.go

@@ -293,7 +293,7 @@ func (w *testImportOrderingWalker) walk(path string, info os.FileInfo, _ error)
 
 	// Ok, now that we have the type, let's see if all members adhere to it.
 	// After that we check if the are in the right order.
-	for i := 0; i < bl; i++ {
+	for i := 0; i <= bl; i++ {
 		for _, p := range blocks[i] {
 			t := importtype(p.Path.Value)
 			if t != ip[i] {