Whenever a variable is needed to denote a smi_bus it is named
accordingly. Fix the last wrong definition.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/22866
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>