ipv6: only generate one new serial number per fib mutation
ipv6: only generate one new serial number per fib mutation

Cc: YOSHIFUJI Hideaki <7736c9d5766cf4b73226bae8c5cb705b73ea83b0@yoshifuji.org>
Cc: Martin Lau <2c0d8efbe28c4f7a45c3ab30c984ed2c126716bd@fb.com>
Signed-off-by: Hannes Frederic Sowa <331be22c6b63ca3e0a03d408c2d906b1b02cd5f2@stressinduktion.org>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs