Fix to unreported bug which printed result of getsockopt even in case when there was no socket error.

server/core/service.c

@@ -1244,7 +1244,6 @@ bool service_set_param_value (
  *	 0 error
  *	 > 0 position in TYPELIB->type_names +1
  */
-
 static int find_type(
 	typelib_t*  tl,
 	const char* needle,

server/modules/protocol/mysql_backend.c

@@ -1070,6 +1070,8 @@ gw_backend_hangup(DCB *dcb)
 
 		len = sizeof(error);
 		if (getsockopt(dcb->fd, SOL_SOCKET, SO_ERROR, &error, &len) == 0)
+		{
+			if (error != 0)
 			{
 				strerror_r(error, buf, 100);
 				LOGIF(LE, (skygw_log_write_flush(
@@ -1078,6 +1080,7 @@ gw_backend_hangup(DCB *dcb)
 						"Error reported is '%s'.",
 						buf)));
 			}
+		}
                 gwbuf_free(errbuf);
                 goto retblock;
         }