staging: r8188eu: remove intermediate token variable

Remove the token variable in on_action_public and use frame_body[2] as
function parameter. This saves another few lines of code.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221230175326.90617-5-martin@kaiser.cx


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