lfs: drop an unnecessary r'' prefix No longer necessary since the source transformer was removed. # skip-blame for changing string prefixes Differential Revision: https://phab.mercurial-scm.org/D7958

lfs: explicitly close the file handle for the blob being uploaded The previous code relied on reading the blob fully to close it. The obvious problem is if an error occurs before that point. But there is also a problem when using workers where the data may need to be re-read, which can't happen once it is closed. This eliminates the surprising behavior before attempting to fix the worker problem. Differential Revision: https://phab.mercurial-scm.org/D7957

lfs: drop the unused progressbar code in the `filewithprogress` class This has been unused since f98fac24b757, which added worker based transfers for concurrency, shifting the progressbar maintenance to the single thread waiting on the worker to complete. Since the name no longer fits, rename the class. Differential Revision: https://phab.mercurial-scm.org/D7956