external/opal-prd: send socket response in the error path
external/opal-prd: send socket response in the error path

The server should send the response in the case of error too,
so that the waiting client is not blocked forever.

Signed-off-by: Neelesh Gupta <0c847490c0192d1430997c36c35afbb478c33ca8@linux.vnet.ibm.com>
Reviewed-by: Patrick Williams <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

qemu/skiboot,legoater/skiboot,open-power/skiboot,csmart/skiboot,shenki/skiboot,apopple/skiboot,open-power/skiboot,mikey/skiboot,shenki/skiboot,stewart-ibm/skiboot,stewart-ibm/skiboot,mikey/skiboot,apopple/skiboot,csmart/skiboot,open-power/skiboot,legoater/skiboot,open-power/skiboot,apopple/skiboot,legoater/skiboot,csmart/skiboot,stewart-ibm/skiboot,legoater/skiboot,qemu/skiboot,shenki/skiboot,open-power/skiboot,qemu/skiboot,qemu/skiboot,shenki/skiboot,qemu/skiboot,mikey/skiboot,legoater/skiboot,shenki/skiboot