Accroding commit 0994375e, which is adding remove_id sysfs attr
for pci drivers, for management tools dynamically bind/unbind
a pci/usb devices to a specified drivers; with this patch,
the management tools can be simplied.

And the original code didn't handle the failure of
usb_create_newid_file, fixed in this patch.
Signed-off-by: NCHENG Renquan <rqcheng@smu.edu.sg>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>