staging: rtl8192e: Remove unused variable isRFOff

isRFOff is just once initialized and changed but never evaluated. Remove
resulting dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/53242638126775f6698fdcfc49ac552a4e08578b.1664616227.git.philipp.g.hortmann@gmail.com


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