[CVE-2009-0029] Rename old_readdir to sys_old_readdir

This way it matches the generic system call name convention.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

arch/m68k/kernel/entry.S

@@ -513,7 +513,7 @@ sys_call_table:
 	.long sys_uselib
 	.long sys_swapon
 	.long sys_reboot
-	.long old_readdir
+	.long sys_old_readdir
 	.long old_mmap		/* 90 */
 	.long sys_munmap
 	.long sys_truncate