Backport crash fix from trunk

svn path=/branches/stable/extragear-kde4/network/ktorrent/; revision=966411

ChangeLog

@@ -12,6 +12,7 @@ Changes in 3.2.2 :
 - Cancel all scan dialogs before exiting, this fixes a crash (191487)
 - Config dialog now embeds pages in scroll areas, so that the dialog also is useable on small screens
 - Make sure dbus names are valid, this fixes an assert (192007)
+- Fix crash when parsing DHT packets (190107)
 
 Changes in 3.2.1 :
 - Resort torrents if display name is changed

libbtcore/bcodec/bdecoder.cpp

@@ -192,7 +192,7 @@ namespace bt
 		bool ok = true;
 		int len = 0;
 		len = n.toInt(&ok);
-		if (!ok)
+		if (!ok || len < 0)
 		{
 			throw Error(i18n("Cannot convert %1 to an int",n));
 		}