Re: brcm80211: drop unreachable else case

the if/elseif/else is exhaustive - there is no 4th case given the 
  rssi_ctrl_mask = RADIO_2055_NBRSSI_SEL | RADIO_2055_WBRSSI_G1_SEL | 
  RADIO_2055_WBRSSI_G2_SEL;
so this unreachable else case (dead code) can be dropped.

Signed-off-by: Nicholas Mc Guire <redacted>

Thanks, applied to wireless-drivers-next.git.

Kalle Valo