$OpenBSD$

hope to fix crasher

--- sope-appserver/NGObjWeb/NGHttp/NGUrlFormCoder.m.orig	Tue Nov  2 15:12:13 2010
+++ sope-appserver/NGObjWeb/NGHttp/NGUrlFormCoder.m	Tue Jul 12 17:35:48 2011
@@ -154,7 +154,7 @@ NGHashMap *NGDecodeUrlFormParameters(const unsigned ch
       value = len > 0 ? urlStringFromBuffer(buffer, len) : (NSString *)@"";
       
       // skip '&'
-      if (_buffer[pos] == '&' || _buffer[pos] == '?') pos++;
+      if ((pos < _len) && (_buffer[pos] == '&' || _buffer[pos] == '?')) pos++;
     }
     
     if (value == nil)