Agree with Jebber.
Whether he was an inmate, or simply in the infirmary, family or friends may have taken the body to be buried at a cemetery/graveyard of their choosing.
If nobody took the body he may have been buried in the nearest such place.
Or even buried in a pauper's grave along with others.
Cannock Cemetery opened in 1882.
Nearby Rugeley Cemetery opened in 1884.
Cannock Workhouse was overseen by a Board of Guardians representing 21 parishes:
Acton and Bednall, Brewood, Bushbury, Cannock, Cheslyn Hay, Church Eaton, Coppenhall, Dunston, Essington, Featherstone,Hatherton, Hilton, Huntington, Kinvaston, Lapley and Wheaton Ashton, Norton, Penkridge, Saredon, Shareshill, Stretton, Great Wyrley.
Potentially he could have been buried in any one of these parishes.