[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>
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 5b78082..5c332f2 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -513,7 +513,7 @@
 	.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