Fix "cvs [update aborted]: out of memory; can not reallocate 5242880 bytes"

when checking out xenocara from a server running OpenBSD/amd64.

While processing RCS deltas, don't allocate twice as much memory as
needed when copying a line vector to a vector which has less lines.
Also, when switching back from a branch to trunk while searching an
RCS file for a revision, free the trunklines vector immediately after
lines saved in it have been copied back into the currentlines vector.
Somehow, these two changes together make the problem go away.

ok tobias@, "this has been a serious annoyance" sthen@, "sure" deraadt@

0 files changed, 0 insertions, 0 deletions