Fix possible double close and closing uninitialized fd in create_inet_stream_socket

[TERESH1]

1. Possible uninitialized data is read from local variable sfd at libinetsocket.c:221. https://github.com/dermesser/libsocket/blob/1a4480a1214cb68cbf28c7f7050cdd76ab85d6f0/C/inet/libinetsocket.c#L155 https://github.com/dermesser/libsocket/blob/1a4480a1214cb68cbf28c7f7050cdd76ab85d6f0/C/inet/libinetsocket.c#L221

2. Handler sfd is passed to a function at libinetsocket.c:221 by calling function close after the handler may already be closed at libinetsocket.c:209. https://github.com/dermesser/libsocket/blob/1a4480a1214cb68cbf28c7f7050cdd76ab85d6f0/C/inet/libinetsocket.c#L194-L221

Setting fd to -1 would avoid the risk of closing a socket that another thread had just opened

Found with Svace