minor fix for linter (facebookresearch#1360)

Summary:
# Before submitting

- [ ] Was this discussed/approved via a Github issue? (no need for typos, doc improvements)
- [ ] Did you read the [contributor guideline](https://github.com/pytorch/fairseq/blob/master/CONTRIBUTING.md)?
- [ ] Did you make sure to update the docs?
- [ ] Did you write any new necessary tests?

## What does this PR do?
Fixes # (issue).

## PR review
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## Did you have fun?
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Pull Request resolved: fairinternal/fairseq-py#1360

Reviewed By: myleott

Differential Revision: D24393217

Pulled By: huihuifan

fbshipit-source-id: a110ef6958b1e15cd8c4e23b610db5cfc994f06d

examples/m2m_100/process_data/remove_too_much_punc.py

@@ -15,8 +15,6 @@ def main(args):
         with open(args.bitext + '.' + args.src_lang, 'wt', encoding=args.encoding) as fsrc:
             with open(args.bitext + '.' + args.tgt_lang, 'wt', encoding=args.encoding) as ftgt:
                 line = tsv.readline()
-                if not line:
-                    continue
                 fields = line.split('\t')
 
                 src, tgt = fields[1], fields[2]