ipvlan: Fix failure path in dev registration during link creation
When newlink creation fails at device-registration, the port->count is decremented twice. Francesco Ruggeri (fruggeri@arista.com) found this issue in Macvlan and the same exists in IPvlan driver too. While fixing this issue I noticed another issue of missing unregister in case of failure, so adding it to the fix which is similar to the macvlan fix by Francesco in commit 30837960 ("macvlan: fix failure during registration v3") Reported-by: Francesco Ruggeri <fruggeri@arista.com> Signed-off-by: Mahesh Bandewar <maheshb@google.com> CC: Eric Dumazet <edumazet@google.com> CC: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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