vhost: fix missing flag reset on stop
vhost: fix missing flag reset on stop

Commit 550c9d27d143 ("vhost: set/reset device flags internally") moves
the VIRTIO_DEV_RUNNING set/reset to vhost lib. But I missed one reset
on stop; here fixes it.

Fixes: 550c9d27d143 ("vhost: set/reset device flags internally")

Reported-by: Ciara Loftus <b3d6c0da41dcf0b8333ab29bfd5c6eca84b2ba45@intel.com>
Signed-off-by: Yuanhan Liu <5dcef21195e64c9c08aa779bb62b25e9133eaa33@linux.intel.com>
Tested-by: Ciara Loftus <b3d6c0da41dcf0b8333ab29bfd5c6eca84b2ba45@intel.com>

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