Fix another case (tx this time) where buffers were not unloaded (nor sync'd).  (bad bad aaron): 90xB works on sparc64, 90x is probably still broken.
Fix another case (tx this time) where buffers were not unloaded (nor sync'd).  (bad bad aaron): 90xB works on sparc64, 90x is probably still broken.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars