add a lookup enum never to escape HSH_Lookup
add a lookup enum never to escape HSH_Lookup

This is caught by

	assert(lr == HSH_HIT || lr == HSH_GRACE);

in cnt_lookup()

gquintard/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache