staging: r8188eu: remove rtw_IOL_append_LLT_cmd()

Function rtw_IOL_append_LLT_cmd() just returns _SUCCESS and the only
caller does not use the return value. Remove it.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210910111110.4628-3-straube.linux@gmail.com


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