vtls: select ssl backend case-insensitive (follow-up)

- Do a case-insensitive comparison of CURL_SSL_BACKEND env as well.

- Change Curl_strcasecompare calls to strcasecompare
  (maps to the former but shorter).

Follow-up to c290b8f.

Bug: https://github.com/curl/curl/commit/c290b8f#commitcomment-24094313

Co-authored-by: Jay Satiro

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/vauth/digest_sspi.c b/lib/vauth/digest_sspi.c
index f5d619c99..a3f96ed24 100644
--- a/lib/vauth/digest_sspi.c
+++ b/lib/vauth/digest_sspi.c
@@ -352,8 +352,8 @@ CURLcode Curl_auth_decode_digest_http_message(const char *chlg,
       if(!Curl_auth_digest_get_pair(p, value, content, &p))
         break;
 
-      if(Curl_strcasecompare(value, "stale")
-         && Curl_strcasecompare(content, "true")) {
+      if(strcasecompare(value, "stale") &&
+         strcasecompare(content, "true")) {
         stale = true;
         break;
       }