let's make sure we collect the right error code from errno, otherwise we'll see EPERM (i.e. error 1) for all errors readv() returns (since it returns -1 on error), including EAGAIN. This is definitely backport material. A fix-up for 3691bcf3c5eebdcca5b4f1c51c745441c57a6cd1. Fixes: #16699
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