staging: rtl8188eu: remove unused variables from core/rtw_efuse.c

staging: rtl8188eu: remove unused variables from core/rtw_efuse.c

Remove set but unused variables from within the file core/rtw_efuse.c
in the function efuse_read_phymap_from_txpktbuf, as they are triggering
kernel test robot warnings. Also, remove the local 'lenc' array as well,
as nothing is done with its values. Keep the two usb_read8 calls
however, as this patch is purely for warnings, not to change behaviour
of the code.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210615223607.13863-4-phil@philpotter.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>