net: dsa: don't use bitmap_weight() in b53_arl_read()

Don't call bitmap_weight() if the following code can get by
without it.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Yury Norov 2022-01-23 10:38:32 -08:00
commit e18e5cbc70