allow negative integers ... should fix random "error, initial meta info failed"

--- bencode.cpp.orig

+++ bencode.cpp

@@ -44,6 +44,10 @@

     p++; len--;

   }

+  if( *p == '-'){

+    p++; len--;

+  }

+

   for(psave = p; len && isdigit(*p); p++,len--) ;

   if(!len || MAX_INT_SIZ < (p - psave) || *p != endchar) return 0;