net: usb: remove leading spaces before tabs

There are a few leading spaces before tabs and remove it by running
the following commard:

    $ find . -name '*.[ch]' | xargs sed -r -i 's/^[ ]+\t/\t/'

Cc: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: NHui Tang <tanghui20@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>