Fix for TLS v1.3 in non-blocking loosing return code from SendBuffered
#7001
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Description
Fix for TLS v1.3 in non-blocking loosing return code from
SendBuffered
.Example: SendBuffered returns WANT_WRITE (-327) and sets ssl->error, then below (11994) it was doing
ssl->error = ret
where ret = 0 and loosing the WANT_WRITE.Testing
Noticed with new non-blocking MQTT TLS tests in wolfSSL/wolfMQTT#373
This PR needs merged before MQTT PR will pass.
Checklist