tests: fix missing zero init.

Change-Id: I94db2ba9e00519c2affc62c333910c75331ae21b
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index f5e99d8..99480c2 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -717,7 +717,7 @@
     // Expected to trigger an error with
     // parameter_validation::validate_struct_pnext
     VkEvent event = VK_NULL_HANDLE;
-    VkEventCreateInfo event_alloc_info;
+    VkEventCreateInfo event_alloc_info = {};
     // Zero-initialization will provide the correct sType
     VkApplicationInfo app_info = {};
     event_alloc_info.sType = VK_STRUCTURE_TYPE_EVENT_CREATE_INFO;