Make test for bug #51056 (blocking read) more reliable

It seems that it might sometimes not return the last 0 bytes on Windows
because it likely signals EOF before that. We do not really

Make test for bug #51056 (blocking read) more reliable

It seems that it might sometimes not return the last 0 bytes on Windows
because it likely signals EOF before that. We do not really need to
check it so only non 0 lines are printed.

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Fix bug #51056: fread() on blocking stream will block even if data is available

This is applied only on socket connection which already returns
immediately if there is no data in the buf

Fix bug #51056: fread() on blocking stream will block even if data is available

This is applied only on socket connection which already returns
immediately if there is no data in the buffer.

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