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

[Guido Günther <guidog src gnome org>]

commit 2691467aa5c4caccc894fbf11a2da27918d413db
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 size_t

 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 0cb58cf..1ac71c4 100644
--- a/src/ka-kerberos.c
+++ b/src/ka-kerberos.c
@@ -466,7 +466,7 @@ auth_dialog_prompter (krb5_context ctx G_GNUC_UNUSED,
             goto cleanup;
         if (password_len + 1 > prompts[i].reply->length) {
             g_warning ("Password too long %d/%zd", password_len + 1,
-                       prompts[i].reply->length);
+                       (size_t)prompts[i].reply->length);
             goto cleanup;
         }