check-gibber-xmpp-stanza.c: don't call debug functions if debug is disabled
check-gibber-xmpp-stanza.c: don't call debug functions if debug is disabled

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut