missed a case in r1538490:

PR56639

Always NULL c->sbh before putting a connection back in a pollset or queue.

We can't NULL c->sbh at the bottom of process_socket() after putting a socket back on 
the event_pollset or having it go into lingering close, because the listener or a worker
thread could A) continue on the connection or B) free and allocate the same conn_rec
pointer before we get to the bottom of process_socket().

Submitted By: Edward Lu
Committed By: covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1604350 13f79535-47bb-0310-9956-ffa450edef68