Fix a build warning found by the kbuild test robot in the most recent
wusbcore patches.
Signed-off-by: NThomas Pugliese <thomas.pugliese@gmail.com>
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>