lazymanifest: drop SP before some labels
These seem to be the only occurrences in our code base, so let's make
it consistent.
lazymanifest: avoid 'bail' label when used on success path
3d485727e45e (lazymanifest: extract function for iterating to next
line, 2015-03-11) introduced a large memory leak because I stopped
running the 'bail' block in the successful case. Let's rename 'bail'
to 'done', since it has to run not only in the error case.