staging: ft1000: ft1000-usb: Removed unnecessary parentheses.

This patch fixes "Unnecessary parentheses" checkpatch.pl warning in
ft1000_hw.c

Signed-off-by: Gulsah Kose <gulsah.1004@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>