Fix a dumb typo - use of & instead of &&

We managed to lose O_DIRECTORY testing due to a stupid typo in commit
1f36f77 ("Switch !O_CREAT case to use of do_last()")

Reported-by: Walter Sheets <w41ter@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/namei.c

@@ -1656,7 +1656,7 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
 		if (path->dentry->d_inode->i_op->follow_link)
 			return NULL;
 		error = -ENOTDIR;
-		if (*want_dir & !path->dentry->d_inode->i_op->lookup)
+		if (*want_dir && !path->dentry->d_inode->i_op->lookup)
 			goto exit_dput;
 		path_to_nameidata(path, nd);
 		audit_inode(pathname, nd->path.dentry);