Add further sanity checking of hdr->error_no (#805)HEADmaster

>>>     CID 467267:  Insecure data handling  (INTEGER_OVERFLOW)
>>>     The cast of "hdr->error_no" to a signed type could result in a negative number.

Indeed, if a client sends a very large ->error_no, this could end up
with a negative errno value. This doesn't seem like an issue, but
nonetheless tighten up our validation.

For some reason Coverity only complained about tran_pipe.c, but the same
problem exists in tran_sock.c.

Signed-off-by: John Levon <john.levon@nutanix.com>

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