tests: Supply (mandatory) multisample state in ColorBlendLogicOpTests

Signed-off-by: Chris Forbes <chrisforbes@google.com>
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index d025d92..3641d81 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -13956,6 +13956,10 @@
     cb_ci.attachmentCount = 1;
     cb_ci.pAttachments = &att;
 
+    VkPipelineMultisampleStateCreateInfo ms_ci = {};
+    ms_ci.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
+    ms_ci.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;
+
     VkGraphicsPipelineCreateInfo gp_ci = {};
     gp_ci.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
     gp_ci.stageCount = 2;
@@ -13965,6 +13969,7 @@
     gp_ci.pViewportState = &vp_state_ci;
     gp_ci.pRasterizationState = &rs_ci;
     gp_ci.pColorBlendState = &cb_ci;
+    gp_ci.pMultisampleState = &ms_ci;
     gp_ci.pDynamicState = &dyn_state_ci;
     gp_ci.flags = VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT;
     gp_ci.layout = pipeline_layout;