Curl_timeleft: change return type to timediff_t

returning 'time_t' is problematic when that type is unsigned and we
return values less than zero to signal "already expired", used in
several places in the code.

Closes #2021

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/ftp.c b/lib/ftp.c
index 5c7df2b4c..8042edf48 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -333,10 +333,10 @@ static CURLcode AcceptServerConnect(struct connectdata *conn)
  * Curl_pgrsTime(..., TIMER_STARTACCEPT);
  *
  */
-static time_t ftp_timeleft_accept(struct Curl_easy *data)
+static timediff_t ftp_timeleft_accept(struct Curl_easy *data)
 {
-  time_t timeout_ms = DEFAULT_ACCEPT_TIMEOUT;
-  time_t other;
+  timediff_t timeout_ms = DEFAULT_ACCEPT_TIMEOUT;
+  timediff_t other;
   struct curltime now;
 
   if(data->set.accepttimeout > 0)