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- Return proper error codes
- Some attribute sizes are not checked
- rta may by NULL
- multiple leaks
- possible unbalanced unlock
- used action is freed after if an error happens while trying to replace
- estimator can't be replaced

This patch makes replacement atomic, so the old action is either
replaced entirely or not touched at all.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>