[master] c749a196a Dont combine VSB_QUOTE_JSON and VSB_QUOTE_CSTR, just emit the double quotes ourselves.

[Poul-Henning Kamp]

commit c749a196a9a7c626b67fc517863edeee4d244984
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Mon Mar 1 13:02:38 2021 +0000

    Dont combine VSB_QUOTE_JSON and VSB_QUOTE_CSTR, just emit the
    double quotes ourselves.

diff --git a/bin/varnishd/mgt/mgt_param_tweak.c b/bin/varnishd/mgt/mgt_param_tweak.c
index b6d97797b..939b2a150 100644
--- a/bin/varnishd/mgt/mgt_param_tweak.c
+++ b/bin/varnishd/mgt/mgt_param_tweak.c
@@ -377,7 +377,9 @@ tweak_string(struct vsb *vsb, const struct parspec *par, const char *arg)
 	if (arg == NULL) {
 		VSB_quote(vsb, *p, -1, 0);
 	} else if (arg == JSON_FMT) {
-		VSB_quote(vsb, *p, -1, VSB_QUOTE_JSON|VSB_QUOTE_CSTR);
+		VSB_putc(vsb, '"');
+		VSB_quote(vsb, *p, -1, VSB_QUOTE_JSON);
+		VSB_putc(vsb, '"');
 	} else {
 		REPLACE(*p, arg);
 	}