tests: Fix warning in LVT

DSBufferInfoErrors test was not freeing memory.

Change-Id: I5bca7884551823dce2ff6e3f40b0ded5889dc5e2
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index 0bbf898..d0685bc 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -8903,6 +8903,7 @@
     vkUpdateDescriptorSets(m_device->device(), 1, &descriptor_write, 0, NULL);
 
     m_errorMonitor->VerifyFound();
+    vkFreeMemory(m_device->device(), mem, NULL);
     vkDestroyDescriptorSetLayout(m_device->device(), ds_layout, NULL);
     vkDestroyBuffer(m_device->device(), buffer, NULL);
     vkFreeDescriptorSets(m_device->device(), ds_pool, 1, &descriptor_set);