authorize_user_token_ldap: sr was under-allocated by one byte.
authorize_user_token_ldap: sr was under-allocated by one byte.

Also change strcat's to sprintf to make code easier to maintain.

madrat-/yubico-pam,Yubico/yubico-pam,madrat-/yubico-pam,eworm-de/yubico-pam,madrat-/yubico-pam,Yubico/yubico-pam,eworm-de/yubico-pam,eworm-de/yubico-pam,Yubico/yubico-pam