[master] 3c77f50 Log what we actually tried to use

[Federico G. Schwindt]

commit 3c77f500e06859063f0e28ab595d6452fc799b5f
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Sun Apr 9 11:38:56 2017 +0900

    Log what we actually tried to use

diff --git a/bin/varnishd/cache/cache_http.c b/bin/varnishd/cache/cache_http.c
index d18ca52..62d98bd 100644
--- a/bin/varnishd/cache/cache_http.c
+++ b/bin/varnishd/cache/cache_http.c
@@ -1210,8 +1210,9 @@ http_PrintfHeader(struct http *to, const char *fmt, ...)
 	va_end(ap);
 	if (n + 1 >= l || to->nhd >= to->shd) {
 		http_fail(to);
-		VSLb(to->vsl, SLT_LostHeader, "%s",
-		    n + 1 >= l ? fmt : to->ws->f);
+		va_start(ap, fmt);
+		VSLbv(to->vsl, SLT_LostHeader, fmt, ap);
+		va_end(ap);
 		WS_Release(to->ws, 0);
 		return;
 	}