[PATCH] pam_cifscreds: fix warning on NULL arg passed to %s in pam_syslog()

[Paulo Alcantara <pc@xxxxxxxxxxxxx>]

Fix the following compiler warning with -Wformat-overflow in
cifscreds_pam_update():

  pam_cifscreds.c: In function ‘cifscreds_pam_update’:
  pam_cifscreds.c:340:83: warning: ‘%s’ directive argument is null
  [-Wformat-overflow=]
    340 | pam_syslog(ph, LOG_ERR, "error: Update credential key for %s: %s",
        |                                                           ^~

Fixes: cbbcd6e71c0a ("cifscreds: create PAM module to insert credentials at login")
Signed-off-by: Paulo Alcantara (Red Hat) <pc@xxxxxxxxxxxxx>
---
 pam_cifscreds.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pam_cifscreds.c b/pam_cifscreds.c
index 5d99c2db3038..eb9851d52a7d 100644
--- a/pam_cifscreds.c
+++ b/pam_cifscreds.c
@@ -338,7 +338,7 @@ static int cifscreds_pam_update(pam_handle_t *ph, const char *user, const char *
 		key_serial_t key = key_add(currentaddress, user, password, keytype);
 		if (key <= 0) {
 			pam_syslog(ph, LOG_ERR, "error: Update credential key for %s: %s",
-				currentaddress, strerror(errno));
+				   (currentaddress ?: "(null)"), strerror(errno));
 		}
 	}
 
-- 
2.44.0