fellow_storage: gc obsolete code

since https://github.com/varnishcache/varnish-cache/pull/3855/files
was merged a long time ago and we never supported 7.2 in a public
release.

src/fellow_storage.c

@@ -2272,10 +2272,6 @@ sfe_open_worker_init(struct sfe_open_worker_priv *sow)
 	return (sow->wrk);
 }
 
-// XXX remove after #3855 merge (7.3 / 8.0 ?)
-//lint -esym(526, HSH_Cleanup)
-void HSH_Cleanup(const struct worker *);
-
 static void
 sfe_open_worker_fini(struct sfe_open_worker_priv *sow)
 {
@@ -2283,10 +2279,6 @@ sfe_open_worker_fini(struct sfe_open_worker_priv *sow)
 
 	CHECK_OBJ_NOTNULL(sow, SFE_OPEN_WORKER_PRIV);
 
-	// XXX remove after #3855 merge (7.3 / 8.0 ?)
-	HSH_Cleanup(sow->wrk);
-	Pool_Sumstat(sow->wrk);
-
 	sow->wrk = NULL;
 
 	assert(sow->state == SOW_RUNNING);