staging: rtl8188eu: remove unused variables from hal/rtl8188e_cmd.c

Remove set but unused variables from within the file hal/rtl8188e_cmd.c
in the function rtl8188e_set_FwMediaStatus_cmd, as they are triggering
kernel test robot warnings.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210615223607.13863-7-phil@philpotter.co.uk


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