Harmonize sctp_handle_sack() and sctp_handle_nr_sack() without any functional change. Cleanup also whitespaces.
Harmonize sctp_handle_sack() and sctp_handle_nr_sack()
without any functional change. Cleanup also whitespaces.

ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl,ossy-szeged/sctp-refimpl