From a29d34b0b7fd9d5b31f0ac10e4f7ee5b32f3e09a Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 8 Aug 2022 13:21:01 +0200
Subject: [PATCH] urldata: make 'negnpn' use less storage

The connectdata struct field 'negnpn' never holds a value larger than
30, so an unsigned char saves 3 bytes struct space.

Closes #9279
---
 lib/urldata.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/urldata.h b/lib/urldata.h
index 4f648778b0..0c252d12af 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1119,7 +1119,8 @@ struct connectdata {
   int localportrange;
   int cselect_bits; /* bitmask of socket events */
   int waitfor;      /* current READ/WRITE bits to wait for */
-  int negnpn; /* APLN or NPN TLS negotiated protocol, CURL_HTTP_VERSION* */
+  unsigned char negnpn; /* APLN or NPN TLS negotiated protocol,
+                           a CURL_HTTP_VERSION* value */
 
 #if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
   int socks5_gssapi_enctype;