In vm_stat_get_per_vm_fops and vcpu_stat_get_per_vm_fops, since we
use nonseekable_open() to open, we should use no_llseek() to seek,
not generic_file_llseek().
Signed-off-by: NGeliang Tang <geliangtang@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>