ethcore/private-tcx: fix deadlock caused by conflicting lock order (#11764)

Author: Boqin Qin

ethcore/private-tx/src/state_store.rs

@@ -90,11 +90,11 @@ impl PrivateStateStorage {
 			request_hashes: request_hashes.clone(),
 			state: RequestState::Syncing,
 		};
+		let mut hashes = self.syncing_hashes.write();
 		let mut requests = self.requests.write();
 		requests.push(request);
 		let mut new_hashes = Vec::new();
 		for hash in request_hashes {
-			let mut hashes = self.syncing_hashes.write();
 			if hashes.insert(hash, Instant::now() + Duration::from_millis(MAX_REQUEST_SESSION_DURATION)).is_none() {
 				new_hashes.push(hash);
 			}