He did the farewell tawaaf at night but was not able to leave Makkah until the following morning

What is prescribed is that the pilgrim’s farewell tawaaf
should be done when he is leaving Makkah al-Mukarramah, because of the
hadeeth of Ibn ‘Abbaas, the authenticity of which is agreed upon: people
were commanded that the last thing they should do is to circumambulate the
House, but an exception was made for menstruating women. So long as you
did this tawaaf with the intention of leaving at night, but you were not
able to do so until the following morning, there is no blame on you for
that, in sha Allah. But if you had repeated tawaaf at the time of your
departure, that would have been more on the safe side. 

And Allah is the source of strength; may Allah send blessings
and peace upon our Prophet Muhammad and his family and Companions. End
quote. 

Standing Committee for Academic Research and Issuing Fatwas. 

Shaykh ‘Abd al-‘Azeez ibn ‘Abd-Allaah ibn Baaz, Shaykh ‘Abd al-Razzaaq ‘Afeefi, Shaykh ‘Abd-Allaah ibn Qa’ood