staging: r8188eu: CurrentOfdm24GTxPwrIdx is set but not used

CurrentOfdm24GTxPwrIdx in struct hal_data_8188e is set but not used.
It can be removed.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220108124959.313215-9-martin@kaiser.cx


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