buffer_list_aggregate_separator(): simplify code

buffer_list_aggregate_separator(): simplify code

Clean up the function by slightly simplifying the logic.

Mostly whitespace changes, so best reviewed using 'git diff -w'.

Signed-off-by: Steffan Karger <steffan.karger@fox-it.com>
Acked-by: Antonio Quartulli <a@unstable.cc>
Message-Id: <1514541271-19597-1-git-send-email-steffan.karger@fox-it.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg16105.html
Signed-off-by: David Sommerseth <davids@openvpn.net>
(cherry picked from commit e883c66b9da390f56ef4a596c9eb6b237a185a50)