virDomainNetDefParseXML: Fix typo

In 9cb89114 we've introduced some logic to clearing suggested
macvtap/macvlan ifnames. The logic consists of comparing ifname
string with strings that libvirt would generate. However, due to
a typo only VIR_NET_GENERATED_MACVTAP_PREFIX was compared. Twice.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/conf/domain_conf.c

@@ -10074,7 +10074,7 @@ virDomainNetDefParseXML(virDomainXMLOptionPtr xmlopt,
         if (ifname &&
             flags & VIR_DOMAIN_DEF_PARSE_INACTIVE &&
             (STRPREFIX(ifname, VIR_NET_GENERATED_MACVTAP_PREFIX) ||
-             STRPREFIX(ifname, VIR_NET_GENERATED_MACVTAP_PREFIX))) {
+             STRPREFIX(ifname, VIR_NET_GENERATED_MACVLAN_PREFIX))) {
             VIR_FREE(ifname);
         }