switch ->mknod() to umode_t

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Documentation/filesystems/vfs.txt

@@ -348,7 +348,7 @@ struct inode_operations {
 	int (*symlink) (struct inode *,struct dentry *,const char *);
 	int (*mkdir) (struct inode *,struct dentry *,umode_t);
 	int (*rmdir) (struct inode *,struct dentry *);
-	int (*mknod) (struct inode *,struct dentry *,int,dev_t);
+	int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
 	int (*rename) (struct inode *, struct dentry *,
 			struct inode *, struct dentry *);
 	int (*readlink) (struct dentry *, char __user *,int);