Make obvious use of xmbtowc()
Make obvious use of xmbtowc()

Should have been fixed in commit 1a4888f ("Unify mbtowc() invocation and
error handling").

DBOTW/pick,thoughtbot/pick,DBOTW/pick,DBOTW/pick,calleerlandsson/pick,calleerlandsson/pick,thoughtbot/pick,thoughtbot/pick,thoughtbot/pick,calleerlandsson/pick