tests: Don't check qobject_type() before qobject_to_qint()

qobject_to_qint(obj) returns NULL when obj isn't a QInt.  Check
that instead of qobject_type(obj) == QTYPE_QINT.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487363905-9480-11-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
