PcloudStimBuff:start: check engine setup()s for error

stimBuffApis/livoxGen1/pcloudStimulusBuffer.cpp

@@ -72,8 +72,20 @@ collationBuffer(
 void PcloudStimulusBuffer::start()
 {
 	// Call ioUringAssemblyEngine setup() as the first step
-	ioUringAssemblyEngine.setup();
-	openClCollatingAndMeshingEngine.setup();
+	if (!ioUringAssemblyEngine.setup())
+	{
+		std::cout <<__func__ <<"Failed to setup() "
+			<<"IOUringAssemblyEngine.\n";
+		return;
+	}
+
+	if (!openClCollatingAndMeshingEngine.setup())
+	{
+		std::cout <<__func__ <<"Failed to setup() "
+			<<"OClCollMeshEngine.\n";
+		return;
+	}
+
 	// Call base class start() as the final step
 	StimulusBuffer::start();
 }