brcmfmac: remove unnecessary curly braces in dhd_attach()

Stumbled into a curly braces used for if statement with only
one conditional statement. Removing them.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
Simple merge