Coverity Scan Static Analysis

[David Stacey]

I've upgraded our Coverity Scan analysis to use Coverity version 
7.7.0.4. I've run this over the most recent snapshot code, and three 
defects were eliminated. I assume these were false positives that were 
reported by Coverity 7.6.0 but fixed in the later version. No new 
defects were detected.

The Coverity Scan analysis is performed on Cygwin snapshots as and when 
they are created. We haven't had a new snapshot for a while, and hence 
it's been over a month since Coverity was run previously.

Dave.