USB: gadget: rndis: fix up coding style issues in the file

Corrected the coding style.
Signed-off-by: NMihai Dontu <mihai.dontu@gmail.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>