pam-module: avoid (null) in debug message

diff --git a/src/login/pam-module.c b/src/login/pam-module.c
index 79a9042ffd4f67845b5ce0500853ff3fff454170..ae4567334acf22c7e29cf29c1f447d5778783ec8 100644 (file)
--- a/src/login/pam-module.c
+++ b/src/login/pam-module.c
@@ -374,7 +374,7 @@ _public_ PAM_EXTERN int pam_sm_open_session(
                            "uid=%u pid=%u service=%s type=%s class=%s desktop=%s seat=%s vtnr=%u tty=%s display=%s remote=%s remote_user=%s remote_host=%s",
                            pw->pw_uid, getpid(),
                            strempty(service),
-                           type, class, desktop,
+                           type, class, strempty(desktop),
                            strempty(seat), vtnr, strempty(tty), strempty(display),
                            yes_no(remote), strempty(remote_user), strempty(remote_host));