[krb5-auth-dialog] Avoid warning when building with MIT Kerberos

[Guido Günther <guidog src gnome org>]

commit 2384bf0bd668a17dca6733dc63bdb8c1f1960bf9
Author: Guido Günther <agx sigxcpu org>
Date:   Sun Jul 16 19:16:04 2017 +0200

    Avoid warning when building with MIT Kerberos
    
    Heimdal uses a long int for timestamps

 src/ka-kerberos.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/ka-kerberos.c b/src/ka-kerberos.c
index 1ac71c4..6526a72 100644
--- a/src/ka-kerberos.c
+++ b/src/ka-kerberos.c
@@ -522,7 +522,7 @@ credentials_expiring (gpointer *data)
 
     KA_DEBUG ("Checking expiry <%ds", ka_applet_get_pw_prompt_secs (applet));
     if (credentials_expiring_real (applet) && is_online) {
-        KA_DEBUG ("Expiry @ %ld", creds_expiry);
+        KA_DEBUG ("Expiry @ %ld", (long int)creds_expiry);
 
         if (!ka_renew_credentials (applet))
             KA_DEBUG ("Credentials renewed");