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;