staging: r8188eu: remove two set but unused variables in core/rtw_mp_ioctl.c

Remove two set but unused variables in core/rtw_mp_ioctl.c to fix a
kernel test robot warning.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210806004034.82233-12-phil@philpotter.co.uk


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