tests: Add missing DestroyRenderPass call in LVT

Change-Id: I0f483883365abe34ce304ab6923e2507d8983367
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index 297bb17..4035539 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -6671,6 +6671,8 @@
                          VK_SUBPASS_CONTENTS_INLINE);
 
     m_errorMonitor->VerifyFound();
+
+    vkDestroyRenderPass(m_device->device(), rp, NULL);
 }
 
 TEST_F(VkLayerTest, EndCommandBufferWithinRenderPass) {