inode->i_op is never NULL

We used to have rather schizophrenic set of checks for NULL ->i_op even
though it had been eliminated years ago.  You'd need to go out of your
way to set it to NULL explicitly _and_ a bunch of code would die on
such inodes anyway.  After killing two remaining places that still
did that bogosity, all that crap can go away.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/xattr.c b/fs/xattr.c
index 468377e..237804c 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -175,7 +175,7 @@
 	if (error)
 		return error;
 	error = -EOPNOTSUPP;
-	if (d->d_inode->i_op && d->d_inode->i_op->listxattr) {
+	if (d->d_inode->i_op->listxattr) {
 		error = d->d_inode->i_op->listxattr(d, list, size);
 	} else {
 		error = security_inode_listsecurity(d->d_inode, list, size);