Fix wolfIP coverity#83

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aidangarske wants to merge 2 commits intomasterfrom

Commits on Mar 20, 2026

Fix wolfip coverity 1683231, 1683213, 1686341, 1683243, 1683239, 1683212, 1683230, 1683217, 1683242 (×3 locations), 1683226, 1683236, 1683238
aidangarske
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return short write (sent) when sent > 0 instead of -1/EAGAIN
aidangarske
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