staging: rtl8192e: Remove priv->rf_chip in _rtl92e_get_channel_map

priv->rf_chip is initialized to RF_8256 and never changed. Remove
condition in function _rtl92e_get_channel_map as it is dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/b8c5a719c6f8930adb87a4ad9bd5d368ba5f348b.1679732276.git.philipp.g.hortmann@gmail.com


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