client 段错误 about rtty HOT 3 CLOSED

libuwsc 版本 2.0.4
OK , 我知道是 cl->send(cl, NULL, 0, WEBSOCKET_OP_CLOSE); 这个问题， 但是为什么会出现cat 文件时会出错，还没清楚，libubox 里面的bug？

应该是server 先close掉了socket，导致client write Broken pipe

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this line
https://github.com/zhaojh329/libuwsc/blob/513aaabb1340d65c1f773dc455ed7066d84a8853/src/uwsc.c#L53
do recursion there:
https://github.com/zhaojh329/libuwsc/blob/513aaabb1340d65c1f773dc455ed7066d84a8853/src/uwsc.c#L429
and
https://github.com/zhaojh329/libuwsc/blob/513aaabb1340d65c1f773dc455ed7066d84a8853/src/uwsc.c#L469
not returned

Simple replace it with

uwsc_error(cl, 0);

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Can you make a PR?
https://github.com/zhaojh329/rtty/blob/master/CONTRIBUTING.md

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