usb: storage: fix wrong comments for struct bulk_cb_wrap

In the flags, direction is in bit 7 instead of bit 0 based
on the specification.

Signed-off-by: Dingyan Li <18500469033@163.com>
Link: https://lore.kernel.org/r/20241020074721.26905-1-18500469033@163.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>