bridge: release IP in case of error
bridge: release IP in case of error

If there is an error after an IP has been allocated it is necesary
to release it.

Signed-off-by: Mauricio Vasquez B <1b9a9da27e253b9dbd24b01ee9bfc1433f3b3bc6@polito.it>

containernetworking/plugins,containernetworking/plugins