41d0ad1d04
A previous commit narrowed the type of .visit_alternate_type() parameter @variants from QAPISchemaVariants to QAPISchemaAlternatives. Rename it to @alternatives. One of them passes @alternatives to helper function gen_visit_alternate(). Rename its @variants parameter to @alternatives as well. Signed-off-by: Markus Armbruster <armbru@redhat.com>