ukvm: Correct call to err()
ukvm: Correct call to err()

Some compilers insist on passing a format string it seems.

Weichen81/solo5,djwillia/solo5,mato/solo5,Solo5/solo5,mato/solo5,Solo5/solo5,mato/solo5,Weichen81/solo5,djwillia/solo5,Weichen81/solo5,djwillia/solo5