net: clean up usbnet_receive()
The USB network interface has two code paths depending on whether or not
RNDIS mode is enabled. Refactor usbnet_receive() so that there is a
common path throughout the function instead of duplicating everything
across if (is_rndis(s)) ... else ... code paths.
Clean up coding style and 80 character line wrap along the way.
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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