[6.1] 715bf4ccb No need to mark the overflow twice

[hermunn]

commit 715bf4ccb7554f42ab915839a5f98ed56769602b
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Mon Sep 24 23:27:29 2018 +0100

    No need to mark the overflow twice

diff --git a/bin/varnishd/cache/cache_http.c b/bin/varnishd/cache/cache_http.c
index 8e41d37b1..2e61ca7cf 100644
--- a/bin/varnishd/cache/cache_http.c
+++ b/bin/varnishd/cache/cache_http.c
@@ -379,7 +379,6 @@ http_CollectHdrSep(struct http *hp, const char *hdr, const char *sep)
 			if (b + x >= e) {
 				http_fail(hp);
 				VSLb(hp->vsl, SLT_LostHeader, "%s", hdr + 1);
-				WS_MarkOverflow(hp->ws);
 				WS_Release(hp->ws, 0);
 				return;
 			}