[Discuss-gnuradio] More Coverity fixes

[Philip Balister]

Here are some simple coverity fixes:

https://github.com/balister/GNU-Radio/commits/cov-fixes

Note one of them messes with the QA code, I see random failures on the
on the tests now. However the original code was clearly bad :)

https://github.com/balister/GNU-Radio/commit/dcdc4655ce08de17ab0f1ffb33f369924f78a20e

I'll look at the adaptive filter stuff some more. Hopefully, itis a
matter of removing un-needed files from the build.

Philip