return null on unused ssl session

git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@52 726aef4b-f618-498e-8847-2d620e286838

Csocket.h

@@ -1505,7 +1505,13 @@ namespace Csocket
 		void SetSSLObject( SSL *ssl ) { m_ssl = ssl; }
 		void SetCTXObject( SSL_CTX *sslCtx ) { m_ssl_ctx = sslCtx; }
 		void SetFullSSLAccept() { m_bFullsslAccept = true; }
-		SSL_SESSION * GetSSLSession() { return( SSL_get_session( m_ssl ) ); }
+		SSL_SESSION * GetSSLSession() 
+		{
+			if ( m_ssl )	
+				return( SSL_get_session( m_ssl ) ); 
+
+			return( NULL );
+		}
 #endif /* HAVE_LIBSSL */
 		
 		//! Get the send buffer