ssl: clear the error queue before SSL_read/write/accept()
If other modules or libraries do not clear the OpenSSL error queue after a failed operation, other code that relies on SSL_get_error() -- in particular, code that deals with SSL_ERROR_WANT_READ/WRITE logic -- will malfunction later on. To prevent this, explicitly clear the error queue before calls like SSL_read/write/accept(). PR: 60223 Submitted by: Paul Spangler <paul.spangler ni.com> git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1769332 13f79535-47bb-0310-9956-ffa450edef68
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