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net/tcp/tcp_send_buffered.c: Fix non-blocking I/O

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My recent changes to buffered tcp send broke this. [1]

One of my local apps using non-blocking tcp is working
again with this fix.

[1]
```
commit 837e1a72a47b4e5a874124e316192b2172301d30
Author: YAMAMOTO Takashi <yamamoto@midokura.com>
Date:   Mon Mar 15 16:19:42 2021 +0900

    tcp_send_buffered.c: improve tcp write buffering
```
This commit is contained in:
YAMAMOTO Takashi 2021-03-29 17:30:14 +09:00 committed by Xiang Xiao
parent 271e748ba5
commit 1c29a2e8e8
1 changed files with 5 additions and 0 deletions
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5
net/tcp/tcp_send_buffered.c
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@ -1259,6 +1259,11 @@ ssize_t psock_tcp_send(FAR struct socket *psock, FAR const void *buf,
if (chunk_result == 0) if (chunk_result == 0)
{ {
DEBUGASSERT(nonblock); DEBUGASSERT(nonblock);
if (result == 0)
{
result = -EAGAIN;
}
break; break;
} }