staging: r8188eu: remove constant rf variable

The rf variable in odm_TXPowerTrackingCallback_ThermalMeter_8188E
is always 1. The for loops that use rf will be executed only once.

We can remove the variable and the loops.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220205113741.379070-6-martin@kaiser.cx


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