[tree-wide] finally take no_llseek out

no_llseek had been defined to NULL two years ago, in commit 868941b
("fs: remove no_llseek")

To quote that commit,

  At -rc1 we'll need do a mechanical removal of no_llseek -

  git grep -l -w no_llseek | grep -v porting.rst | while read i; do
    sed -i '/\<no_llseek\>/d' $i
  done

  would do it.

Unfortunately, that hadn't been done.  Linus, could you do that now, so
that we could finally put that thing to rest? All instances are of the
form
    .llseek = no_llseek,
so it's obviously safe.

virt/kvm/kvm_main.c

@@ -5727,7 +5727,6 @@ static const struct file_operations stat_fops_per_vm = {
 	.release = kvm_debugfs_release,
 	.read = simple_attr_read,
 	.write = simple_attr_write,
-	.llseek = no_llseek,
 };
 
 static int vm_stat_get(void *_offset, u64 *val)