atm: use for_each_set_bit()
Replace open-coded loop with for_each_set_bit(). Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com> Cc: Chas Williams <chas@cmf.nrl.navy.mil> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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