fix fuzz

Author: Rain Liu

fuzz/fuzz_targets/parse_session.rs

@@ -3,5 +3,5 @@ use libfuzzer_sys::fuzz_target;
 
 fuzz_target!(|data: &[u8]| {
     let mut cursor = std::io::Cursor::new(data);
-    let _session = sdp::session_description::SessionDescription::unmarshal(&mut cursor);
+    let _session = sdp::SessionDescription::unmarshal(&mut cursor);
 });