flexelint b78cb58a

Yes, we do not actually use the mode name, but we still want to have it
for debugging and clarity.

Info 754: local struct member 'vsc_sf_mode::name' (line 57, file
    ../../lib/libvarnishapi/vsc.c) not referenced

lib/libvarnishapi/vsc.c

@@ -152,6 +152,7 @@ vsc_sf_arg(struct vsc *vsc, const char *glob, const struct vsc_sf_mode *mode)
 	AN(sf);
 	REPLACE(sf->pattern, glob);
 	sf->mode = mode;
+	AN(mode->name);
 	if (mode->append)
 		VTAILQ_INSERT_TAIL(&vsc->sf_list, sf, list);
 	else