Merge branch 'net-bridge-minor-followup-optimizations'

Nikolay Aleksandrov says:

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net: bridge: minor followup optimizations

After the converted flags to bitops we can take advantage of the flags
assignment and remove one test and three atomic bitops from the learning
paths (patch 01 and patch 02), patch 03 restores the unlikely() when taking
over HW learned entries.

v2: a clean export of the latest set version
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Signed-off-by: David S. Miller <davem@davemloft.net>