vhost: fix queue initialization
vhost: fix queue initialization

This patch allocates vhost queue by rte_zmalloc() to avoid
undefined values.

Fixes: a277c7159876 ("vhost: refactor code structure")
Cc: stable@dpdk.org

Signed-off-by: Jiayu Hu <32e4f0527a0c8fd19a4086e4191a246becffadac@intel.com>
Reviewed-by: Maxime Coquelin <9a2667dee3b90866bbc9c2696cff2b7d5616c95a@redhat.com>
Tested-by: Yinan Wang <49b1c4c1483798ccfe23a5285410aaacc037c97a@intel.com>

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