fix async kv store in sweeper

Author: joostjager

lightning/src/util/sweep.rs

@@ -640,14 +640,12 @@ where
 	) -> Pin<Box<dyn Future<Output = Result<(), io::Error>> + 'a + Send>> {
 		let encoded = &sweeper_state.encode();
 
-		let result = self.kv_store.write(
+		self.kv_store.write(
 			OUTPUT_SWEEPER_PERSISTENCE_PRIMARY_NAMESPACE,
 			OUTPUT_SWEEPER_PERSISTENCE_SECONDARY_NAMESPACE,
 			OUTPUT_SWEEPER_PERSISTENCE_KEY,
 			encoded,
-		);
-
-		Box::pin(async move { result })
+		)
 	}
 
 	fn spend_outputs(