fix RwLockWriteGuard import

Author: arik-so

lightning/src/lib.rs

@@ -158,7 +158,7 @@ mod sync {
 	#[cfg(test)]
 	pub use debug_sync::*;
 	#[cfg(not(test))]
-	pub use ::std::sync::{Arc, Mutex, Condvar, MutexGuard, RwLock, RwLockReadGuard};
+	pub use ::std::sync::{Arc, Mutex, Condvar, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard};
 }
 
 #[cfg(not(feature = "std"))]

lightning/src/routing/network_graph.rs

@@ -37,11 +37,10 @@ use io;
 use prelude::*;
 use alloc::collections::{BTreeMap, btree_map::Entry as BtreeEntry};
 use core::{cmp, fmt};
-use sync::{RwLock, RwLockReadGuard};
+use sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
 use core::sync::atomic::{AtomicUsize, Ordering};
 use sync::Mutex;
 use core::ops::Deref;
-use std::sync::RwLockWriteGuard;
 use bitcoin::hashes::hex::ToHex;
 
 #[cfg(feature = "std")]