Fix peer communication vulnerability (no known exploits) reported by Ben Hawkes

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14303 f4695dd4-2c0a-0410-b89c-da849a56a58e
fix tr_bencParseStr() bug reported by Ben Hawkes

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14304 f4695dd4-2c0a-0410-b89c-da849a56a58e