If cmd_details are defined or async flag is set,
don't copy the desc/buff back to temp.
Fixes: e5b2a9e957e7 ("net/avf/base: add base code for avf PMD")
Cc: stable@dpdk.org
Signed-off-by: Steven Zou <steven.zou@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
c60fad5626