[ 34/54] vhost: fix mergeable bufs on BE hosts

3.4-stable review patch. If anyone has any objections, please let me know. -- From: "Michael S. Tsirkin" commit 910a578f7e9400a78a3b13aba0b4d2df16a2cb05 upstream. We copy head count to a 16 bit field, this works by chance on LE but on BE guest gets 0. Fix it up.

[ 34/54] vhost: fix mergeable bufs on BE hosts

3.4-stable review patch. If anyone has any objections, please let me know. -- From: Michael S. Tsirkin m...@redhat.com commit 910a578f7e9400a78a3b13aba0b4d2df16a2cb05 upstream. We copy head count to a 16 bit field, this works by chance on LE but on BE guest gets 0. Fix it up.