i2c: Fix multiple-enqueue of the same request on NACK
i2c: Fix multiple-enqueue of the same request on NACK

i2c_request_send() will retry the request if the error is a NAK,
however it forgets to clear the "ud.done" flag. It will thus
loop again and try to re-enqueue the same request causing internal
request list corruption.

Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.ibm.com>

legoater/skiboot,legoater/skiboot,open-power/skiboot,stewart-ibm/skiboot,shenki/skiboot,stewart-ibm/skiboot,open-power/skiboot,shenki/skiboot,shenki/skiboot,shenki/skiboot,stewart-ibm/skiboot,qemu/skiboot,qemu/skiboot,open-power/skiboot,legoater/skiboot,qemu/skiboot,open-power/skiboot,qemu/skiboot,legoater/skiboot,legoater/skiboot,open-power/skiboot,qemu/skiboot,shenki/skiboot