staging: brcm80211: fix checkpatch errors from main.c

The softmac source file main.c was passed through checkpatch to see
what issues against coding style are still present. This patch removes
the checkpatch errors listed below.

ERROR: trailing whitespace
+^Imemcpy(wlc->default_bss->rateset.rates, rs.rates, $
--
ERROR: spaces required around that ':' (ctx:VxV)
+       pval = arg ? (int *)arg:NULL;
--

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