contrib/plugins: fix coverity warning in lockstep

Coverity complains that e don't check for a truncation when copying in
the path. Bail if we can't copy the whole path into sockaddr.

Fixes: CID 1519045
Fixes: CID 1519046
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231009164104.369749-25-alex.bennee@linaro.org>
1 file changed