[6.0] 9e7db2130 Try to appease Sun CC

[Dridi Boukelmoune]

commit 9e7db2130f9ce14023d44d6ef341ec4d89ded050
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Sat Apr 14 11:24:08 2018 +0100

    Try to appease Sun CC

diff --git a/bin/varnishtest/vtc_server.c b/bin/varnishtest/vtc_server.c
index ca8c6a5d4..04199de11 100644
--- a/bin/varnishtest/vtc_server.c
+++ b/bin/varnishtest/vtc_server.c
@@ -340,7 +340,7 @@ server_dispatch_thread(void *priv)
 		s2->run = 1;
 		AZ(pthread_create(&s2->tp, NULL, server_dispatch_wrk, s2));
 	}
-	pthread_cleanup_pop(1);
+	NEEDLESS(pthread_cleanup_pop(1));
 	NEEDLESS(return(NULL));
 }