staging: r8188eu: rfPath is always 0

The rfPath variable in Hal_ReadTxPowerInfo88E is always 0. Remove the
variable and use 0 directly.

Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220105083426.177128-2-martin@kaiser.cx


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