tests/test-filelog.py.out

bundlerepo: use for loop over iterator instead of while True

The iter() builtin has a neat pattern where you give it a callable of
no arguments and a sentinel value, and you can then loop over the
function calls like a normal iterator. This cleans up the code a
little.

ERROR: FIXME: This is a known failure of filelog.size for data starting with \1\n
OK.