i2o_driver_dispatch — dispatch an I2O reply message
I2O controller of the message
I2O message number
The reply is delivered to the driver from which the original message was. This function is only called from interrupt context.
Returns 0 on success and the message should not be flushed. Returns > 0 on success and if the message should be flushed afterwords. Returns negative error code on failure (the message will be flushed too).