fix: add return when receive unexpected error

Signed-off-by: ningmingxiao <ning.mingxiao@zte.com.cn>

Author: ningmingxiao

server.go

@@ -558,7 +558,7 @@ func (c *serverConn) run(sctx context.Context) {
 				return
 			}
 			log.G(ctx).WithError(err).Error("error receiving message")
-			// else, initiate shutdown
+			return
 		case <-shutdown:
 			return
 		}