lookupModSpawn fix

The function getEntitySpawningPacket(Entity entity) calls the following function with false as second argument. However, the way it is coded that flag will be ignored. [it will search up the class tree for no reason,  which is unintended behavior]

Current method in cpw.mods.fml.common.registry.EntityRegistry:

public EntityRegistration lookupModSpawn(Class<? extends Entity> clazz, boolean keepLooking)
    {
        Class<?> localClazz = clazz;

        do
        {
            EntityRegistration er = entityClassRegistrations.get(localClazz);
            if (er != null)
            {
                return er;
            }
            localClazz = localClazz.getSuperclass();
            keepLooking = (!Object.class.equals(localClazz));
        }
        while (keepLooking);

        return null;
    }

Proposed code to make the keepLooking parameter actually useful:

public EntityRegistration lookupModSpawn(Class<? extends Entity> clazz, boolean keepLooking)
    {
        Class<?> localClazz = clazz;

        do
        {
            EntityRegistration er = entityClassRegistrations.get(localClazz);
            if (er != null)
            {
                return er;
            }
            localClazz = localClazz.getSuperclass();
        }
        while (keepLooking && (!Object.class.equals(localClazz)));

        return null;
    }

This might already be changed, but I checked 1208 and it isn't.