staging: brcm80211: removed likely/unlikely calls

There was no performance rationale to use these guys.

Reported-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>