staging:ccg: Fix missing brackets for sizeof (found by sparse).

Fix following:
WARNING: sizeof fsg should be sizeof(fsg)
+	memset(&fsg, 0, sizeof fsg);

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Reviewed-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>