f - scope instead of mem::drop

Author: ViktorTigerstrom

lightning/src/ln/channelmanager.rs

@@ -3654,31 +3654,29 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 
 					true
 				});
+			}
 
-				mem::drop(channel_state_lock);
-
-				self.claimable_htlcs.lock().unwrap().retain(|payment_hash, (_, htlcs)| {
-					if htlcs.is_empty() {
-						// This should be unreachable
-						debug_assert!(false);
+			self.claimable_htlcs.lock().unwrap().retain(|payment_hash, (_, htlcs)| {
+				if htlcs.is_empty() {
+					// This should be unreachable
+					debug_assert!(false);
+					return false;
+				}
+				if let OnionPayload::Invoice { .. } = htlcs[0].onion_payload {
+					// Check if we've received all the parts we need for an MPP (the value of the parts adds to total_msat).
+					// In this case we're not going to handle any timeouts of the parts here.
+					if htlcs[0].total_msat == htlcs.iter().fold(0, |total, htlc| total + htlc.value) {
+						return true;
+					} else if htlcs.into_iter().any(|htlc| {
+						htlc.timer_ticks += 1;
+						return htlc.timer_ticks >= MPP_TIMEOUT_TICKS
+					}) {
+						timed_out_mpp_htlcs.extend(htlcs.into_iter().map(|htlc| (htlc.prev_hop.clone(), payment_hash.clone())));
 						return false;
 					}
-					if let OnionPayload::Invoice { .. } = htlcs[0].onion_payload {
-						// Check if we've received all the parts we need for an MPP (the value of the parts adds to total_msat).
-						// In this case we're not going to handle any timeouts of the parts here.
-						if htlcs[0].total_msat == htlcs.iter().fold(0, |total, htlc| total + htlc.value) {
-							return true;
-						} else if htlcs.into_iter().any(|htlc| {
-							htlc.timer_ticks += 1;
-							return htlc.timer_ticks >= MPP_TIMEOUT_TICKS
-						}) {
-							timed_out_mpp_htlcs.extend(htlcs.into_iter().map(|htlc| (htlc.prev_hop.clone(), payment_hash.clone())));
-							return false;
-						}
-					}
-					true
-				});
-			}
+				}
+				true
+			});
 
 			for htlc_source in timed_out_mpp_htlcs.drain(..) {
 				let receiver = HTLCDestination::FailedPayment { payment_hash: htlc_source.1 };