When looking for revision, break out of the loop at the end rather than

When looking for revision, break out of the loop at the end rather than
looping forever.

This prevents the server going into an infinite loop when the repository
is behind the checkout, but the behaviour is not correct (it is an error
rather than ignoring the file), so mark with an XXX for now. Some
underlying OpenCVS functions are too fatal()-happy and will probably
need to be changed in order to fix this properly.

Problem reported by sthen.

ok xsa ray