wiredtiger/wiredtiger — pull request #1491 by keithbostic (2014-12-17 22:25:00+00:00)
Title: Check the block header checksum before we clear it.

Check the block header checksum before we clear it, it should be the same as the passed-in checksum, and if just those 4 bytes are corrupted, we wouldn't noticed. SERVER-16457.

I also rephrased the code to assume success is the faster path.

@agorrod, would please review this one and merge if you're happy with it?