tests: Fix CmdClearAttachmentTests error

Fix CmdClearAttachmentTests unexpected error.

Change-Id: Id545b0ff96d9eb96822a21878de2c7fc1e584cb9
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index 5e8c8ff..34f076f 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -11132,10 +11132,8 @@
     VkPipelineObj pipe(m_device);
     pipe.AddShader(&vs);
     pipe.AddShader(&fs);
+    pipe.AddColorAttachment();
     pipe.SetMSAA(&pipe_ms_state_ci);
-    m_errorMonitor->SetUnexpectedError(
-        "If pColorBlendState is not NULL, The attachmentCount member of pColorBlendState must be equal to the colorAttachmentCount "
-        "used to create subpass");
     pipe.CreateVKPipeline(pipeline_layout, renderPass());
 
     m_commandBuffer->BeginCommandBuffer();