[Fix] Redis crashes at startup.
[Fix] Redis crashes at startup.

This commit fixes the problem reported by:
https://github.com/MSOpenTech/redis/issues/304
https://github.com/MSOpenTech/redis/issues/306
A previous commit that fixed a socketstate leak exposed another existing bug:
if FDAPI_AcceptEx() fails the socketstate is accessed after the socket has
already been closed and the socketstate memory has been released, causing
a heap corruption exception .

[Fix] Improved error handlingin WSIOCP_Listen().

laurencee/redis,damy/redis,Jonavin/redis,Jonavin/redis,laurencee/redis,Jonavin/redis,Cybermaxs/redis,quangnguyen90/redis,janeasystems/redis,Cybermaxs/redis,janeasystems/redis,damy/redis,janeasystems/redis,Cybermaxs/redis,jaambee/redis,jaambee/redis,damy/redis,Cybermaxs/redis,quangnguyen90/redis,janeasystems/redis,janeasystems/redis,laurencee/redis,Jonavin/redis,damy/redis,laurencee/redis,Cybermaxs/redis,quangnguyen90/redis,laurencee/redis,jaambee/redis,quangnguyen90/redis,Jonavin/redis,damy/redis,jaambee/redis,quangnguyen90/redis,jaambee/redis