NEWS: mention Coverity bug fixes

[Nick Clifton]

Hi Guys,

   Right, I agree with Ian that the original wording was a little too much 
advertising.  So I have gone with a similar to Michael's suggestion, namely:

   Resolved 37 coding problems in bfd including static array overruns, null
   pointer dereferences and use of a malloc buffer after it has been freed,
   as revealed by static analysis donated by Coverity, Inc.
   (http://scan.coverity.com).

Cheers
   Nick