[CVE-2009-0029] Make sys_syslog a conditional system call

Remove the -ENOSYS implementation for !CONFIG_PRINTK and use
the cond_syscall infrastructure instead.

Acked-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

kernel/printk.c

@@ -742,11 +742,6 @@ EXPORT_SYMBOL(vprintk);
 
 #else
 
-asmlinkage long sys_syslog(int type, char __user *buf, int len)
-{
-	return -ENOSYS;
-}
-
 static void call_console_drivers(unsigned start, unsigned end)
 {
 }