Don't use a list if we look for a single driver. (#444)
Don't use a list if we look for a single driver. (#444)

The driver_name arg can be a single value or a list. The list is only needed
if we look for one of many options.
rhempel/ev3dev-lang-python,dwalton76/ev3dev-lang-python,dwalton76/ev3dev-lang-python