enhance t2, and scan_ldapbindrequest doesn't count the method tag.

scan_ldapbindrequest.c

@@ -13,7 +13,6 @@ int scan_ldapbindrequest(const char* src,const char* max,
     long method;
     if (!(tmp=scan_asn1tag(src+res,max,&tc,&tt,&method))) return 0;
     if (tc!=PRIVATE || tt!=PRIMITIVE) return 0;
-    res+=tmp;
   }
   return res;
 }