iOS: Compile error in il2cpp-codegen.h

The following code doesn't compile under iOS (XCode 8.2.1, iOS 10) unless you add the last line to return NULL:

inline void* UnBox(Il2CppCodeGenObject* obj, Il2CppClass* expectedBoxedClass)
{
NullCheck(obj);

if (obj->klass->element_class == expectedBoxedClass->element_class)
return il2cpp::vm::Object::Unbox(obj);

RaiseInvalidCastException(obj, expectedBoxedClass);
return NULL; // Must be added or compiler errors that the function can return without a value
}