We not only check the return value, but also check the errno != 0.
Because in rare cases connect() will return -1 but the errno
is 0 (for example, on Android 4.3, OnePlus phone A0001_12_150227)
and actually the tcp three-way handshake is completed.
PR-URL: https://github.com/libuv/libuv/pull/936
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Imran Iqbal <imran@imraniqbal.org>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
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