allow build_open_flags() to return an error

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/internal.h b/fs/internal.h
index 6812158..f6ad343 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -96,11 +96,12 @@
 	umode_t mode;
 	int acc_mode;
 	int intent;
+	int lookup_flags;
 };
 extern struct file *do_filp_open(int dfd, struct filename *pathname,
-		const struct open_flags *op, int flags);
+		const struct open_flags *op);
 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
-		const char *, const struct open_flags *, int lookup_flags);
+		const char *, const struct open_flags *);
 
 extern long do_handle_open(int mountdirfd,
 			   struct file_handle __user *ufh, int open_flag);