make ->atomic_open() return int

Change of calling conventions:
old		new
NULL		1
file		0
ERR_PTR(-ve)	-ve

Caller *knows* that struct file *; no need to return it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index f9a3251..f7e8e82 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -806,9 +806,9 @@
 				    loff_t off, size_t len);
 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
 extern int ceph_open(struct inode *inode, struct file *file);
-extern struct file *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
-				     struct opendata *od, unsigned flags,
-				     umode_t mode, int *opened);
+extern int ceph_lookup_open(struct inode *dir, struct dentry *dentry,
+			     struct opendata *od, unsigned flags,
+			     umode_t mode, int *opened);
 extern int ceph_release(struct inode *inode, struct file *filp);
 
 /* dir.c */