liuhuahang ce634578dd This change implements the SO_ERROR socket option that is used to obtain the last error reported by the network.
Squashed commit of the following:

Author: Gregory Nutt <gnutt@nuttx.org>

    net/: Trivial changes to PR from review.  Biggest difference:  type of s_error changed to int16_t to save a byte or two.

Author: liuhuahang <liuhuahang@xiaomi.com>

    Implement SO_ERROR for getsockopt()
2019-12-24 08:09:55 -06:00
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