vhost: fix return value on dequeue path
vhost: fix return value on dequeue path

This patch fixes the incorrect return value for rte_vhost_dequeue_burst()
when virtqueue is not enabled or virtqueue address translation fails.

Fixes: 62250c1d0978 ("vhost: extract split ring handling from Rx and Tx functions")

Signed-off-by: Jiayu Hu <32e4f0527a0c8fd19a4086e4191a246becffadac@intel.com>
Reviewed-by: Jens Freimann <ca9361fbe2c56b38bfc6f0fa839493a196cfbd8f@redhat.com>
Acked-by: Tiwei Bie <f338cf29d7d69ff1bc99f755ebfb0eb0accd409e@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk