staging: usbip: stub_main.c: reorder functions

Reorder functions so sysfs_ops, show() and store(), are adjacent, and
init_busid_table() is at the beginning of the file.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>