Add the ENOATTR error number ("No such attribute")

The ENOATTR error number is needed by the file system specific code that
implements Extended Attributes.  This error can occur when trying to retrieve,
replace (XATTR_REPLACE flag) or delete an attribute that does not exist.

--- linux-2.5.30/include/linux/errno.h.orig	Fri Aug  2 15:17:14 2002
+++ linux-2.5.30/include/linux/errno.h	Fri Aug  2 15:17:17 2002
@@ -11,6 +11,9 @@
 #define ERESTARTNOHAND	514	/* restart if no handler.. */
 #define ENOIOCTLCMD	515	/* No ioctl command */
 
+/* Extended Attributes */
+#define ENOATTR		516	/* No such attribute */
+
 /* Defined for the NFSv3 protocol */
 #define EBADHANDLE	521	/* Illegal NFS file handle */
 #define ENOTSYNC	522	/* Update synchronization mismatch */