altsvc: make saving the cache an atomic operation

... by writing the file to temp name then rename to the final when done.

Assisted-by: Jay Satiro
Fixes #4936
Closes #4942

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/url.c b/lib/url.c
index f3b26dafa..d6adf7177 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -380,7 +380,7 @@ CURLcode Curl_close(struct Curl_easy **datap)
   Curl_safefree(data->state.ulbuf);
   Curl_flush_cookies(data, TRUE);
 #ifdef USE_ALTSVC
-  Curl_altsvc_save(data->asi, data->set.str[STRING_ALTSVC]);
+  Curl_altsvc_save(data, data->asi, data->set.str[STRING_ALTSVC]);
   Curl_altsvc_cleanup(data->asi);
   data->asi = NULL;
 #endif