fake_gv_camera: fix memory leak and correctly check for getifaddrs return value.
fake_gv_camera: fix memory leak and correctly check for getifaddrs return value.

AnilRamachandran/aravis,AravisProject/aravis,AnilRamachandran/aravis,AravisProject/aravis,AravisProject/aravis,lu-zero/aravis,AnilRamachandran/aravis,lu-zero/aravis,lu-zero/aravis,AnilRamachandran/aravis,AravisProject/aravis,AnilRamachandran/aravis,AravisProject/aravis,lu-zero/aravis,lu-zero/aravis