Remove shadow warn. (MQTTAsync_completeConnection)

fixd: when restore command, "topics" no malloc.

Removes shadow of previous defined local (m).
Especially because the two are of different types:

MQTTAsyncs* m
Messages* m
Signed-off-by: Niklas Johansson <niklas.johansson@prevas.dk>

fix issue that MQTTClient_connect hangs on network outage, for windows

Signed-off-by: LeonLi <liting6680@gmail.com>

Signed-off-by: ubyyj <wdyuanyoujun@163.com>

Remove shadow warning and improve consistency

Fix Socket_setnonblocking() for Windows (At least if build with MSVC …

Signed-off-by: Juergen Kosel <juergen.kosel@softing.com>

Partially revert commit a16cff63 for file
src/Socket.c

- Do not include errno.h for Windows build
- Use errno as a local variable in Socket_setnonblocking() for Windows
Signed-off-by: Juergen Kosel <juergen.kosel@softing.com>