visit_type_intN() and visit_type_uintN() fail when the value is out of
bounds.
This is appropriate with an input visitor: the value comes from input,
and input may be bad.
It should never happen with the other visitors: the value comes from
the caller, and callers must keep it within bounds. Assert that.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200424084338.26803-10-armbru@redhat.com>