staging: brcm80211: cleaned up fullmac macro BRCMF_PM_RESUME_RETURN_ERROR

Macros impacting the code flow are sort of frowned upon. No other macro's
in the source code impact the code flow. Replaced macro by function.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Franky Lin <frankyl@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>