staging: gdm724x: fix misplaced open braces

This patch fixes the following checkpatch.pl issues in gdm_usb.c:
ERROR: that open brace { should be on the previous line

Signed-off-by: Cihangir Akturk <cakturk@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>