[6.0] 46d4d5941 Revert "Fix WS_Reserve() error handling"

[Reza Naghibi]

commit 46d4d594157583cab7886b032aa11ff848ff7c51
Author: Reza Naghibi <reza at naghibi.com>
Date:   Mon Aug 17 10:11:54 2020 -0400

    Revert "Fix WS_Reserve() error handling"
    
    This reverts commit 0e32f1667ea55156fc2a7fa84e3f1080a05bcb2e.
    
     Conflicts:
            bin/varnishd/http2/cache_http2_deliver.c

diff --git a/bin/varnishd/http2/cache_http2_deliver.c b/bin/varnishd/http2/cache_http2_deliver.c
index 304dab2de..ceb2b46c3 100644
--- a/bin/varnishd/http2/cache_http2_deliver.c
+++ b/bin/varnishd/http2/cache_http2_deliver.c
@@ -230,10 +230,8 @@ h2_build_headers(struct vsb *resp, struct req *req)
 	ssize_t sz, sz1;
 
 	l = WS_ReserveAll(req->ws);
-	if (l < 10) {
-		WS_Release(req->ws, 0);
+	if (l < 10)
 		return (-1);
-	}
 
 	AN(VSB_new(resp, req->ws->f, l, VSB_FIXEDLEN));