net/telnet: fix a potential busyloop if rxbuffer writes faster than read #3894
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Summary
net/telnet: fix a potential busyloop if rxbuffer writes faster than read
Telnet cache will calculate be 0 if write faster than reading:
https://github.com/apache/incubator-nuttx/blob/dbf9c87a428612a2e3374e24081621502eebd822/drivers/net/telnet.c#L1311-L1317
Impact
CPU loading will increase if telnet testing write a long needles command
Testing
telnet test