Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 3a5c73f344d9d5d89b2881b2c3569cac3ca89ad9
      
https://github.com/Perl/perl5/commit/3a5c73f344d9d5d89b2881b2c3569cac3ca89ad9
  Author: Tony Cook <[email protected]>
  Date:   2020-01-06 (Mon, 06 Jan 2020)

  Changed paths:
    M ext/POSIX/POSIX.xs
    M ext/POSIX/lib/POSIX.pod
    M ext/POSIX/t/sigset.t

  Log Message:
  -----------
  error check the calls to sigaddset in POSIX::SigSet->new

Coverity complained that SvIV() could return negative numbers,
but doesn't complain about the similar call in the sigaddset()
method, which is error checked.

So error check sigaddset() and throw an error if it fails.

CID 244386.

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