gv_device: don't NULL terminate the raw genicam data.
gv_device: don't NULL terminate the raw genicam data.

First of all, it was wrong for zipped data, as I guess there is no
reason the zipped data should be NULL terminated. And even for xml
text, as we have the data size, we will not use strlen on it.

AnilRamachandran/aravis,AnilRamachandran/aravis,AravisProject/aravis,AnilRamachandran/aravis,AravisProject/aravis,AravisProject/aravis,AravisProject/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis,AravisProject/aravis