stop passing nameidata to ->lookup()

Just the flags; only NFS cares even about that, but there are
legitimate uses for such argument.  And getting rid of that
completely would require splitting ->lookup() into a couple
of methods (at least), so let's leave that alone for now...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/logfs/dir.c b/fs/logfs/dir.c
index bea5d1b..8a3dcc6 100644
--- a/fs/logfs/dir.c
+++ b/fs/logfs/dir.c
@@ -349,7 +349,7 @@
 }
 
 static struct dentry *logfs_lookup(struct inode *dir, struct dentry *dentry,
-		struct nameidata *nd)
+		unsigned int flags)
 {
 	struct page *page;
 	struct logfs_disk_dentry *dd;