auth_challenge varargck check correct arg

Reference: /n/sources/patch/applied/authvarargck
Date: Fri Aug 15 14:01:46 CES 2008
Signed-off-by: quanstro@quanstro.net

--- /sys/include/auth.h	Fri Aug 15 14:01:42 2008
+++ /sys/include/auth.h	Fri Aug 15 14:01:41 2008
@@ -139,5 +139,5 @@
 extern int		auth_wep(char*, char*, ...);
 #pragma varargck argpos auth_proxy 3
 #pragma varargck argpos auth_challenge 1
-#pragma varargck argpos auth_respond 3
+#pragma varargck argpos auth_respond 8
 #pragma varargck argpos auth_getuserpasswd 2