staging: rtl8723bs: remove assignment in condition in core/rtw_ieee80211.c

staging: rtl8723bs: remove assignment in condition in core/rtw_ieee80211.c

fix the following checkpatch warning:

ERROR: do not use assignment in if condition
1118: FILE: drivers/staging/rtl8723bs/core/rtw_ieee80211.c:1118:
+		if ((addr = of_get_property(np, "local-mac-address", &len)) &&

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/8e784a7e1407924724c97398af8e5aeb23460612.1616600897.git.fabioaiuto83@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>