[tsan] Fix some tiny errors.

Summary:
1. Fix spell error for sigaction.
2. Make line_length <= 80.

Reviewers: llvm-commits, eugenis, kcc, dvyukov

Subscribers: tberghammer, danalbert, srhines

Differential Revision: http://reviews.llvm.org/D16210

llvm-svn: 257872
2 files changed