security_util: fix log in virSecurityMoveRememberedLabel

Fix incorrect log message for timestamp value.
Probably this line was copied from the check for attr.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 7cfb7aab57 ("security_util: Remove stale XATTRs")
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

src/security/security_util.c

@@ -502,7 +502,7 @@ virSecurityMoveRememberedLabel(const char *name,
         } else if (errno != ENODATA) {
             virReportSystemError(errno,
                                  _("Unable to get XATTR %1$s on %2$s"),
-                                 attr_name, src);
+                                 timestamp_name, src);
             return -1;
         }
     }