[Citadel Development] ical_ctdl_is_overlap.c: cleaned it up

[Art Cancro <a...@citadel.org>]

ical_ctdl_is_overlap.c: cleaned it up

https://code.citadel.org?p=citadel.git;a=commitdiff;h=cf62d75a721b553e35bcbcc040dde194d69b87be