Manual code cleanup

Author: douglaz

lightning-rapid-gossip-sync/src/lib.rs

@@ -191,8 +191,7 @@ mod tests {
 			}
 
 			fn get_test_file_path(&self) -> String {
-				let graph_sync_test_directory = self.get_test_directory();
-				graph_sync_test_directory + "/test_data.lngossip"
+				self.get_test_directory() + "/test_data.lngossip"
 			}
 		}