Clear the output socket descriptor in unixd_accept() to make sure

we don't supply a bogus socket to the caller if the accept fails.
(This was causing problems in the worker MPM, which tried to process
the returned socket if it was non-NULL, even if unixd_accept()
returned an error.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92837 13f79535-47bb-0310-9956-ffa450edef68