staging: brcm80211: bugfix for stack dump on firmware load problems

If there is a problem with the firmware load (eg, firmware not present in
/lib/firmware/brcm), then the driver would dump its stack instead of bailing
out gracefully. Root cause was an uninitialized variable (wl->pub) being
dereferenced in the rfkill portion of a cleanup routine (wl_remove). Fix was
to move the rfkill calls into the correct spot in wl_remove().

Signed-off-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>