[master] 8b122ca Add a needless return for gcc

[Poul-Henning Kamp]

commit 8b122caa338680d535671585aa0c58f9809e69e6
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Sun May 31 06:33:32 2015 +0000

    Add a needless return for gcc

diff --git a/bin/varnishd/cache/cache_backend_poll.c b/bin/varnishd/cache/cache_backend_poll.c
index 8928d38..b6a0235 100644
--- a/bin/varnishd/cache/cache_backend_poll.c
+++ b/bin/varnishd/cache/cache_backend_poll.c
@@ -338,6 +338,7 @@ vbp_thread(struct worker *wrk, void *priv)
 			// XXX: ehh... ?
 		}
 	}
+	NEEDLESS_RETURN(NULL);
 }