[COVERITY 71006] Fixed resource leak
[COVERITY 71006] Fixed resource leak

Tested on SkyController : no regression found.
Can't test on drone.

CID 71006 (#1 of 1): Resource leak (RESOURCE_LEAK)
7. leaked_handle: Handle variable deviceSocket going out of scope leaks
the handle.

Change-Id: I4361bfe4a6c0284d29a6e2513afdbed79c88347f
Reviewed-on: https://gerrit.parrot.biz/18010
Reviewed-by: Nicolas Brulez <c7b4d7ddc34318e865922d5ddc9ce680dfb1b14c@parrot.com>

Parrot-Developers/libARDiscovery,Parrot-Developers/libARDiscovery,Parrot-Developers/libARDiscovery,Parrot-Developers/libARDiscovery