timediff: make it 64 bit (if possible) even with 32 bit time_t

... to make it hold microseconds too.

Fixes #4165
Closes #4168

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/url.c b/lib/url.c
index d17016607..68cc5b232 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -972,7 +972,8 @@ static int call_extract_if_dead(struct connectdata *conn, void *param)
 static void prune_dead_connections(struct Curl_easy *data)
 {
   struct curltime now = Curl_now();
-  time_t elapsed = Curl_timediff(now, data->state.conn_cache->last_cleanup);
+  timediff_t elapsed =
+    Curl_timediff(now, data->state.conn_cache->last_cleanup);
 
   if(elapsed >= 1000L) {
     struct prunedead prune;